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                                                                    EXHIBIT 4.24

                  LEASING COMPANY SECURITY AND PLEDGE AGREEMENT
                         [PLD Capital Asset (U.S.) Inc.]


      THIS LEASING COMPANY SECURITY AND PLEDGE AGREEMENT (the "Security
Agreement") is made and entered into as of June 15, 1998 by PLD Capital Asset
(U.S.) Inc., a Delaware corporation (the "Leasing Company"), in favor of THE
BANK OF NEW YORK, a New York banking corporation, as trustee (in such capacity,
the "Senior Note Trustee") under the Senior Note Indenture (as defined herein)
for the holders of the Senior Notes (as hereinafter defined), THE BANK OF NEW
YORK, a New York banking corporation, as trustee (in such capacity, the
"Convertible Note Trustee") under the Convertible Note Indenture (as defined
herein) for the holders of the Convertible Notes (as hereinafter defined) and
THE BANK OF NEW YORK as collateral agent (in such capacity, the "Collateral
Agent").

                              W I T N E S S E T H:

      WHEREAS, Petersburg Long Distance Inc., an Ontario corporation (the
"Company"), as issuer, the Senior Note Trustee, and NWE Capital (Cyprus)
Limited, a Cypriot corporation ("NWE Cyprus"), the Leasing Company, PLD Asset
Leasing Limited, a Cypriot corporation ("PLD Asset Leasing"), and, together with
the Leasing Company, (the "Leasing Companies"), Wireless Technology Corporations
Limited, a British Virgin Islands Company ("WTC"), and Baltic Communications
Limited, a Russian joint stock company of the closed type ("BCL"), as guarantors
(the "Senior Note Guarantors"), have entered into an indenture dated as of May
31, 1996 (as amended, amended and restated, supplemented or otherwise modified
from time to time, the "Senior Note Indenture") pursuant to which the Company is
issuing $ 123,000,000 in aggregate principal amount at Stated Maturity of its
14% Senior Discount Notes due 2004 (the "Senior Notes");

      WHEREAS, the Company, as issuer, the Convertible Note Trustee, and NWE
Cyprus, the Leasing Companies, WTC and BCL, as guarantors (the "Convertible
Note Guarantors") have entered into an indenture dated as of May 31, 1996 (as
amended, amended and restated, supplemented or otherwise modified from time to
time, the "Convertible Note Indenture") pursuant to which the Company is
issuing $26,500,000 in aggregate principal amount of its 9% Convertible
Subordinated Notes due 2006 (the "Convertible Notes"); and

      WHEREAS, to secure its obligations under the Senior Note Indenture, its
Senior Note Guarantee and the other Collateral Documents (as defined in the
Senior Note Indenture) (together with the Company's obligations under the Senior
Note Indenture and the Senior Note Collateral Documents and the Senior Note
Guarantors' obligations under the Senior Note Indenture, the guarantees
contained therein (the "Senior Note Guarantees") and the Senior Note Collateral
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Documents, the "Senior Note Obligations") and to secure its obligations under
the Convertible Note Indenture and the Convertible Notes and the other
Convertible Note Collateral Documents (as defined in the Convertible Note
Indenture) (together with the Convertible Note Guarantors obligations under the
Convertible Note Indenture, the guarantees contained therein (the "Convertible
Note Guarantees") and the Convertible Note Collateral Documents, the
"Convertible Note Obligations"), the Leasing Company has agreed (i) to grant to
the Collateral Agent for the benefit of the Senior Note Trustee and the equal
and ratable benefit of the Holders of the Senior Notes and for the benefit of
the Convertible Note Trustee and for the equal and ratable benefit of the
Holders of the Convertible Notes, Liens and security interests in and to the
Collateral (as defined herein) and (ii) to execute and deliver this Security
Agreement in order to secure the payment and performance by the Leasing Company
and the Guarantors of the Senior Note Obligations and the Convertible Note
Obligations (collectively, the "Obligations").

                                    AGREEMENT

      NOW, THEREFORE, in consideration of the premises and in order to induce
the Holders of the Senior Notes to purchase the Senior Notes and the Holders of
the Convertible Notes to purchase the Convertible Notes, the Leasing Company
hereby agrees with the Collateral Agent, with the Senior Note Trustee for its
benefit and the equal and ratable benefit of the Holders of the Senior Notes and
for the Convertible Note Trustee for its benefit and the equal and ratable
benefit of the Holders of the Convertible Notes as follows:

      SECTION 1. DEFINITIONS. Capitalized terms used herein and not otherwise
defined herein shall have the meaning given to such terms in the Senior Note
Indenture. In addition to any other defined terms used herein, the following
terms shall constitute defined terms for the purposes of this Security
Agreement:

      "Default" means a "Default" as defined in Section 1.1 of the Senior Note
Indenture until the Senior Notes are no longer outstanding and the Senior Note
Indenture has been satisfied and discharged, in which case a "Default" means a
"Default" as defined in Section 1.1 of the Convertible Note Indenture.

      "Permitted Liens" means "Permitted Liens" as defined in Section 1.1 of the
Senior Note Indenture until the Senior Notes are no longer outstanding and the
Senior Note Indenture has been satisfied and discharged, in which case
"Permittee Liens" means "Permitted Liens" as defined in Section 1.1 of the
Convertible Note Indenture.

      "Event of Default" means an "Event of Default" as defined in Section 1.1
of the Senior Note Indenture until the Senior Notes are no longer outstanding
and the Senior Note Indenture and the Senior Note Collateral Documents have been
satisfied, discharged and released, in which case "Event of Default" means an
"Event of Default" as defined in Section 1.1 of the Convertible Note Indenture.

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      "Trustees" means, collectively, the Senior Note Trustee and the
Convertible Note Trustee.

      SECTION 2. CREATION OF SECURITY INTEREST. The Leasing Company hereby
grants to the Collateral Agent for the benefit of the Senior Note Trustee and
for the equal and ratable benefit of the Holders of the Senior Notes and for the
benefit of the Convertible Note Trustee and for the equal and ratable benefit of
the Holders of the Convertible Notes, Liens and a continuing security interest
in and to the collateral described in Section 3 hereof (the "Collateral") in
order to secure the payment and performance of all Obligations.

      SECTION 3. COLLATERAL, The Collateral is:

      (a) Qualified Investments. All Qualified Investments, whether now or
hereafter acquired by the Leasing Company, including those Qualified Investments
listed on Schedule A attached hereto (or substitutions, replacements and
proceeds thereof) but excluding any Qualified Investments made with the
dividends, distributions, payments and products and proceeds of Technocom
Preferred Stock (as defined in the Company Convertible Note Security Agreement)
and the funds and Eligible Cash Equivalents in the Company Convertible Note
Escrow Account (collectively, the "Excluded Qualified Investments"), and the
certificates, agreements, documents, notes, collateral documents and instruments
representing or relating to such Qualified Investments, all contract rights,
instruments, general intangibles and other obligations or other receivables of
any kind relating to such Qualified Investments, all Liens relating to or
securing such Qualified Investments and the related collateral documents which
grant such Liens and all products and proceeds of the Qualified Investments,
including, without limitation, all dividends, options, warrants, rights,
subscriptions, all interest and principal payments, and other property or
proceeds from time to time received, receivable or otherwise distributed in
respect of or in exchange for any or all of the Qualified Investments;

      (b) Telecommunications Asset Agreements. All Telecommunications Asset
Agreements of the Leasing Company, whether now existing or hereinafter acquired
and entered into, including those Telecommunications Asset Agreements listed on
Schedule B attached hereto, and all proceeds and products relating thereto or
therefrom, including all payments (including all time payments and rental
payments) and all other payments thereunder, all cash, property or proceeds from
time to time received, receivable or otherwise distributed or paid in connection
therewith, and all documents, documents of title, certificates of title, letters
of credit, letters of credit proceeds, collateral and liens securing or relating
to such Telecommunications Asset Agreements and all books, records, ledger
sheets and files of the Leasing Company relating to any of the foregoing;

      (c) Asset Sale Proceeds of Telecommunications Assets. All proceeds or
products of an Asset Sale of Telecommunications Assets subject to a
Telecommunications Asset Agreement, whether now existing or hereafter acquired,
including all Cash Proceeds, Eligible Cash Equivalents, Investments and
Property;

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      (d) Leasing Company Escrow Account. The Leasing Company Escrow Account and
all funds contained therein and all Investments made by the Escrow Agent (as
defined in the Leasing Company Escrow Account Agreement) therewith (whether or
not constituting Eligible Cash Equivalents) and all proceeds thereto and
including income therefrom;

      (e) Intercompany Notes. All Intercompany Notes, whether executed on the
Issue Date or thereafter, from any Restricted Subsidiary, excluding, however,
any Intercompany Notes (or substitutes, replacements and proceeds thereof,
including the funds and Eligible Cash Equivalents in the Company Convertible
Note Escrow Account) evidencing loans or advances made by the Leasing Company
with dividends, distributions, payments and products or proceeds of Technocom
Preferred Stock or otherwise constituting Collateral under the Company
Convertible Note Security Agreement (as defined therein) (collectively, the
"Excluded Intercompany Notes"), all Liens securing such Intercompany Notes and
the related collateral documents, and the instruments representing such
Intercompany Notes, and, except as otherwise provided elsewhere herein, all
products and proceeds of such Intercompany Notes, including, without limitation,
all interest and principal payments, instruments, and other property from time
to time received, receivable or otherwise distributed in respect of or in
exchange for such Intercompany Notes; and

      (f) After-acquired Collateral and Proceeds. All items described in this
Section 3 (other than those items specifically excluded), whether now owned or
hereafter, at any time acquired by the Leasing Company and wherever located,
including (except as otherwise provided herein) all replacements, additions,
accessions, substitutions, repairs, proceeds and products relating thereto or
therefrom, and all documents, ledger sheets, files, books and records of the
Leasing Company relating thereto. Proceeds hereunder include (i) whatever is now
or hereafter received by the Leasing Company upon the sale, exchange, collection
or other disposition of any item of Collateral; (ii) any property of the type or
types described in subsections (a), (b), (c) or (e) now or hereafter acquired by
the Leasing Company with any proceeds of Collateral hereunder, and (iii) any
payments under any insurance or any indemnity, warranty or guaranty, payable by
reason of loss or damage to or otherwise with respect to any of the foregoing
Collateral.

      SECTION 4. DELIVERY OF COLLATERAL. All certificates or instruments
representing or evidencing the Collateral shall be delivered to and held by or
on behalf of the Collateral Agent pursuant hereto and shall be in suitable form
for transfer by delivery, or shall be accompanied by duly executed instruments
of transfer or assignment in blank, all in form and substance satisfactory to
the Collateral Agent, and shall be accompanied by any required transfer tax
stamps. Upon the occurrence and during the continuance of an Event of Default,
the Collateral Agent shall have the right, at any time in its discretion and
without notice to the Leasing Company, but subject to its compliance with the
requirements of applicable law, to transfer to or to register in the name of the
Collateral Agent or any of its nominees any or all of the Collateral. In
addition, upon the occurrence and during the continuance of an Event of Default,
but subject to its compliance with the requirements of applicable law, the
Collateral


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Agent shall have the right at any time to exchange certificates or instruments
representing or evidencing Qualified Investments constituting Collateral for
certificates or instruments of smaller or larger denominations.

      SECTION 5. REPRESENTATIONS AND WARRANTIES. The Leasing Company hereby
represents and warrants to the Collateral Agent and the Trustees that, except as
specified in Schedule C attached hereto:

      (a) Legal Power. The execution, delivery and performance by the Leasing
Company of this Security Agreement are within the Leasing Company's legal
powers, have been duly authorized by all necessary corporate action, require no
action by or in respect of, or filing with (except for any filings provided for
hereunder), any governmental authority, require no consent of any other Person
and do not contravene, or constitute a default under, any provision of
applicable law or regulation or of the articles of incorporation or bylaws, or
comparable organizational documents of, the Leasing Company or of any agreement
(after giving effect to the use of proceeds of the issuance of the Senior
Notes), judgment, injunction, order, decree or other instrument binding upon the
Leasing Company or result in the creation or imposition of any Lien on any asset
of the Leasing Company (other than the Liens created by this Security Agreement,
the Leasing Company Escrow Account Agreement and the other Senior Note
Collateral Documents to which the Leasing Company is a party) and the Liens
created by the Convertible Note Indenture and the Convertible Note Collateral
Documents;

      (b) Title to Collateral. The Leasing Company is the legal, record and
beneficial owner of the Collateral existing on the Issue Date (the "Existing
Collateral"), free and clear of any Lien or claims of any person except for the
Liens listed on Schedule D attached hereto and the Liens created by this
Security Agreement, the Leasing Company Escrow Account Agreement and any of the
other Senior Note Collateral Documents.

      (c) Enforceability. This Security Agreement has been duly executed and
delivered by the Leasing Company and constitutes a legal, valid and binding
obligation of the Leasing Company, enforceable against the Leasing Company in
accordance with its terms, except as such enforceability may be limited by the
effect of any applicable bankruptcy, insolvency, reorganization, moratorium or
other similar laws affecting creditors' rights generally or general principles
of equity and commercial reasonableness.

      (d) Perfection: Priority. Upon the execution and delivery of the Leasing
Company Escrow Account Agreement, which is being done contemporaneously with the
execution and delivery of this Security Agreement, the delivery to the
Collateral Agent of the Collateral and the filing of the Senior Note Collateral
Documents relating to the Existing Collateral and the documents listed on
Schedule E attached hereto, to the extent such security interest is created
under applicable federal and New York laws, the security interest and Liens in
the Collateral created pursuant to this Security Agreement and the Leasing
Company Escrow Account Agreement create a valid and perfected first priority
security interest, subject to the


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Liens listed on Schedule D attached hereto in the Existing Collateral, securing
the payment of the Obligations for the benefit of the Senior Note Trustee and
the Holders of the Senior Notes and the Convertible Note Trustee and the Holders
of the Convertible Notes, and enforceable as such against all creditors of the
Leasing Company and any Persons purporting to purchase any of the Existing
Collateral from the Leasing Company other than as permitted by the Senior Note
Indenture; as of the date hereof (and after giving effect to the use of proceeds
of the issuance of the Senior Notes), there are no other security interests in
or Liens on the Existing Collateral or any portion thereof, and no financing
statement pledge, notice of Lien, assignment or collateral assignment, mortgage
or deed of trust covering the Existing Collateral or any portion thereof ("Lien
Notice") exists or is on file in any public office, except with respect to Liens
listed on Schedule E attached hereto, the Liens created by this Security
Agreement and the other Senior Note Collateral Documents and any junior Liens on
Telecommunications Asset Agreements or Qualified Investments constituting
Collateral securing Intercompany Notes evidencing loans or advances made by the
Company to the Leasing Company.

      (e) Offices. The Leasing Company's chief executive office is located at
the address shown as the chief executive office in Schedule F attached hereto
("Chief Executive Office"), and the Leasing Company has no places of business
other than as set forth in such Schedule F, except as permitted hereafter by
Section 6(c) hereof.

      (f) Business Names. The Leasing Company has not conducted its businesses
under any corporate, partnership or fictitious name during the five (5) years
preceding the date hereof, other than those names set forth on Schedule G
attached hereto.

      (g) No Consents. No consent of any other person and no consent,
authorization, approval, or other action by, and no notice to or filing with,
any governmental authority or regulatory body is required either (i) for the
granting of the Liens by the Leasing Company on the Collateral pursuant to this
Security Agreement or for the execution, delivery or performance of this
Security Agreement by the Leasing Company (except for filings listed on Schedule
D attached hereto, the filings and/or other actions necessary to maintain the
perfection of the Liens on the Collateral and perfect Liens on after-acquired
Collateral or the proceeds of the Collateral) or (ii) for the exercise by the
Collateral Agent of the voting or other rights provided for in this Security
Agreement or the remedies in respect of the Collateral pursuant to this Security
Agreement, except, in each case, as may be required in connection with any such
disposition by laws affecting the offering and sale of the Qualified
Investments constituting Collateral.

      (h) Litigation. No litigation, investigation or proceeding of or before
any arbitrator or governmental authority is pending or, to the knowledge of the
Leasing Company, threatened by or against the Leasing Company with respect to
this Security Agreement or any of the transactions contemplated hereby.


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      (i) Accurate Information. As of the date hereof, all information set forth
herein relating to the Collateral is accurate and complete in all respects.

      SECTION 6. COVENANTS.

      (a) Lien Notices. The Leasing Company will defend its interest in the
Collateral against all claims and demands of all persons at any time claiming
the same or any interest therein and the Leasing Company will not permit any
Lien Notices with respect to the Collateral or any portion thereof to exist or
be on file in any public office for more than 30 days after the Leasing Company
shall have notice thereof, except with respect to Permitted Liens or Liens
otherwise permitted by Section 4.11 of the Senior Note Indenture. The Leasing
Company will advise the Collateral Agent and the Trustees promptly, in
reasonable detail, at the addresses as specified in Section 17(a) of this
Agreement, of any Lien (other than Permitted Liens) on, or claim asserted
against, any of the Collateral.

      (b) Location of Collateral. The Leasing Company will keep all of its
Collateral now held or subsequently acquired by it at the locations specified on
Schedule H hereto, or at locations hereafter established in compliance with
Section 6(c) hereof (except for Collateral held by the Collateral Agent, a
Trustee or the Escrow Agent), unless the Leasing Company shall have given the
Collateral Agent and the Trustees prior written notice thereof and shall have in
advance executed and caused to be filed and/or delivered to the Collateral Agent
and the Trustees any financing or other documents required by the Trustees or
the Collateral Agent in order to perfect, protect and preserve the Liens and
security interest created hereby, all in form and substance satisfactory to the
Collateral Agent and the Trustees.

      (c) Location of Offices: Corporation Name: Legal Structure. The Leasing
Company will not change the location of its chief executive office or establish
any place of business other than those set forth on Schedule F attached hereto,
or voluntarily or involuntarily change its name, identity or legal structure,
including without limitation any continuance, amalgamation, merger,
consolidation or sale of substantially all of its assets, unless the Leasing
Company shall have given the Collateral Agent and the Trustees at least 30 days
prior written notice thereof and shall have in advance executed and caused to be
filed and or delivered to the Collateral Agent and the Trustees any financing
Statements or other Senior Note Collateral Documents required by the Collateral
Agent and the Trustees in order to perfect, protect and preserve the Liens and
security interest created hereby, all in form and substance satisfactory to the
Trustees and the Collateral Agent.

      (d) Additional Collateral: Further Assurances. The Leasing Company agrees
that immediately upon becoming the beneficial owner of any additional
Telecommunications Asset Agreement and proceeds of Asset Sales of
Telecommunications Assets subject to a Telecommunications Asset Agreement, any
Qualified Investments constituting Collateral or Intercompany Notes constituting
Collateral, it will pledge and deliver to the Collateral Agent for the benefit
of the Senior Note Trustee and the equal and ratable benefit of the Holders of
the

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Senior Notes and for the benefit of the Convertible Note Trustee and the equal
and ratable benefit of the Holders of the Convertible Notes, the certificates,
instruments and documents representing such proceeds of Asset Sales of
Telecommunications Assets subject to a Telecommunications Asset Agreement, such
Qualified Investments and such Intercompany Notes (as well as duly executed
instruments of transfer or assignment in blank), and grant to the Collateral
Agent for the benefit of the Senior Note Trustee and the equal and ratable
benefit of the Holders of the Senior Notes and for the benefit of the
Convertible Note Trustee and for the equal and ratable benefit of the Holders of
the Convertible Notes pursuant to appropriate and necessary Senior Note
Collateral Documents, a continuing first priority security interest in and Liens
on such proceeds of Telecommunications Assets, such Qualified Investments or
such Intercompany Notes, all in form and substance satisfactory to the
Collateral Agent and the Trustees. The Leasing Company shall also promptly (and
in any event within five (5) Business Days after receipt thereof), subject to
its compliance with the requirements of applicable law, deliver to the
Collateral Agent any other documents of title, promissory notes, certificates or
instruments representing Collateral which it holds. The Leasing Company further
agrees that it will promptly (and in any event within 5 Business Days after such
acquisition) deliver to the Collateral Agent and the Trustees an amendment, duly
executed by the Leasing Company, in substantially the form of Schedule I hereto
(an "Additional Collateral Amendment"), with respect to the additional
Collateral that is to be pledged pursuant to this Security Agreement. The
Leasing Company hereby authorizes the Collateral Agent and the Trustees to
attach each Additional Collateral Amendment to this Security Agreement and
agrees that any stock, notes or other forms of Investment listed on any
Additional Collateral Amendment delivered to the Collateral Agent or the
Trustees shall for all purposes hereunder be considered Collateral. The Leasing
Company will, promptly upon request by the Trustee, (i) execute and deliver,
cause to be executed and filed, or use its best efforts to give any notices, in
all appropriate jurisdictions (including Canada, Cyprus, the Russian Federation
and Kazakstan) or procure any financing statements, assignments, pledges or
other documents, all in form and substance satisfactory to the Collateral Agent
and the Trustee, (ii) mark any chattel paper constituting Collateral, and
deliver any certificates, chattel paper or instruments constituting Collateral
to the Collateral Agent or the Trustees, (iii) execute and deliver or cause to
be executed and delivered all stock powers, proxies, assignments, instruments
and other documents, all in form and substance satisfactory to the Collateral
Agent and the Trustee, and (iv) take any other actions that are necessary or, in
the reasonable opinion of the Collateral Agent and the Trustees, desirable to
perfect or continue the perfection and the priority of the Collateral Agent's
security interest and Liens in the Collateral, to protect the Collateral against
the rights, claims, or interests of third Persons other than holders of
Permitted Liens or Liens otherwise permitted by Section 4.11 of the Senior Note
Indenture or to effect the purposes of this Security Agreement. The Leasing
Company also hereby authorizes the Collateral Agent to file any financing or
continuation statements with respect to the Collateral without the signature of
the Leasing Company to the extent permitted by applicable law.

      (e) Disposition of Collateral. The Leasing Company will not sell,
transfer, assign, pledge, collaterally assign, exchange or otherwise dispose of,
or grant any option or warrant with respect to, any of the Collateral or any
Telecommunications Assets subject to a


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Telecommunications Asset Agreement except as permitted by the Senior Note
Indenture and the Convertible Note Indenture. If the proceeds of any sale of any
Collateral are notes, instruments, documents of title, standby letters of credit
or chattel paper, such proceeds shall be promptly delivered to the Collateral
Agent to be held as Collateral hereunder. If the Collateral, or any part
thereof, is sold, transferred, assigned, exchanged, or otherwise disposed of in
violation of these provisions, the security interest and Liens of the Collateral
Agent shall continue in such Collateral or part thereof notwithstanding such
sale, transfer, assignment, exchange or other disposition, and the Leasing
Company will hold the proceeds thereof in an separate account for the benefit of
the Senior Note Trustee and for the equal and ratable benefit of the Holders of
the Senior Notes and the benefit of the Convertible Note Trustee and for the
equal and ratable benefit of the Holders of the Convertible Notes and transfer
such proceeds to the Collateral Agent or the applicable Trustee in kind to be
held as Collateral hereunder.

      (f) Restrictive Agreements. The Leasing Company agrees that, except for
existing agreements set forth on Schedule J attached hereto, it will not (i)
enter into any agreement or understanding that purports to or may restrict or
inhibit the Collateral Agent's or the Trustees' rights or remedies hereunder,
including, without limitation, the Collateral Agent's or the Trustees' right to
sell or otherwise dispose of the Collateral or amend or modify in any manner
materially adverse to the Trustees the existing agreements set forth as Schedule
J attached hereto, (ii) permit any issuer to continue, merge, amalgamate or
consolidate, unless all outstanding Capital Stock owned by the Leasing Company
of the surviving corporation is, upon such continuation, merger, amalgamation or
consolidation, pledged hereunder to the Collateral Agent or (iii) fail to pay or
discharge any tax, assessment or levy of any nature not later than five days
prior to the date of any proposed sale under any judgment writ or warrant of
attachment with regard to the Collateral.

      (g) Rights of Collateral Agent and Trustees. Upon the occurrence and
during the continuance of an Event of Default, the Collateral Agent and the
Trustees shall have the right at any time to make any payments and do any other
acts as the Collateral Agent or either Trustee may deem necessary to protect the
Liens and security interest of the Collateral Agent in the Collateral,
including, without limitation, the rights to pay, purchase, contest or
compromise any Lien which, in the judgment of the Collateral Agent or such
Trustee, appears to be prior to or superior to the Liens and security interest
granted hereunder, and challenge any action or proceeding purporting to affect
its Liens and security interest in the Collateral. The Leasing Company hereby
agrees to reimburse the Collateral Agent and the Trustees for all payments made
and expenses incurred under this Security Agreement including reasonable fees,
expenses and disbursements of attorneys and paralegals acting for the Trustees,
including any of the foregoing payments under or acts taken to perfect or
protect its Liens and security interest in the Collateral, which amounts shall
be secured under this Security Agreement, and agrees that it shall be bound by
any payment made or act taken by the Collateral Agent or the Trustees hereunder.
Neither the Collateral Agent nor the Trustees shall have any obligation to make
any of the foregoing payments or perform any of the foregoing acts.



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      (h) Records. The Leasing Company will keep and maintain at its own cost
and expense satisfactory and complete records of the Collateral.

      (i) Access. On reasonable notice to the Leasing Company, except at any
time during the continuation of Default or an Event of Default, both the
Collateral Agent and the Trustees shall at all times have full and free access
during normal business hours to all the books, correspondence and records of the
Leasing Company relating to the Collateral, and the Collateral Agent and its
representatives, and the Trustees and their respective representatives, may
examine the same, take extracts therefrom and make photocopies thereof, and the
Leasing Company agrees to render to the Collateral Agent and/or the applicable
Trustee, at the Leasing Company's cost and expense, such clerical and other
assistance, at all times and in such manner as may be requested with regard
thereto. On reasonable notice to the Leasing Company, except at any time during
the continuation of a Default or an Event of Default, the Collateral Agent and
its representatives, and the Trustees and their respective representatives,
shall at all times also have the right to enter, during normal business hours,
into and upon any premises where any of the Collateral is located for the
purpose of inspecting the same, observing its use or otherwise protecting its
interests therein.

      (j) Taxes. The Leasing Company shall pay all taxes, assessments and
government charges and all claims as and to the extent required by Section 4.6
of each of the Senior Note Indenture and the Convertible Note Indenture;
provided that the Leasing Company shall in any event pay such taxes, assessments
or levies not later than five days prior to the date of any proposed sale under
any judgment, writ or warrant of attachment with regard to any Collateral of the
Leasing Company entered or filed against the Leasing Company as a result of the
failure to make such payment.

      (k) Demand Obligations. The Leasing Company agrees that it will cause each
of the Restricted Subsidiaries that is obligated on any Intercompany Note
constituting Collateral that constitutes a demand obligation, within the meaning
of Section 3-108 of the Uniform Commercial Code of the State of New York, to
execute and deliver to the Collateral Agent and/or the Trustees a new instrument
extending, renewing and replacing such demand obligation not later than the
second anniversary of the date of original issue thereon and on each succeeding
second anniversary thereof.

      SECTION 7. VOTING RIGHTS: DIVIDENDS: ETC.

      (a) So long as no Event of Default shall have occurred and be continuing,
the Leasing Company shall be entitled to exercise any and all voting and other
consensual rights pertaining to the Collateral, including amending, modifying,
supplementing or replacing any Telecommunications Asset Agreement, or any part
thereof for any purpose not inconsistent with the terms of this Security
Agreement, the Senior Note Indenture or any other Senior Note Collateral
Document or the Convertible Note Indenture or any Convertible Note Collateral
Documents; provided that the Leasing Company shall not exercise or shall refrain
from


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exercising any such right if such action would be inconsistent with or violate
any provisions of this Security Agreement, the Senior Note Indenture or any
other Senior Note Collateral Document or the Convertible Note Indenture or any
Convertible Note Collateral Documents.

      (b) All payments made from time to time on, or with respect to Collateral,
whether interest, principal, dividends, distributions or otherwise, shall
constitute Collateral and shall be delivered to the applicable Trustee for
deposit in the Leasing Company Escrow Account.

      (c) All payments made from time to time on, or with respect to a
Telecommunications Asset Agreement, Intercompany Notes, Qualified Investments
(other than Excluded Qualified Investments) constituting Collateral and
Intercompany Notes constituting a Loan or advance made by the Company from the
net proceeds of the Senior Notes and any other Intercompany Notes constituting
loans or advances to the Leasing Companies, whether lease payments and rents,
interest or principal payments, dividends, distributions or otherwise, shall be
delivered to the applicable Trustee for deposit in the Leasing Company Escrow
Account or the Convertible Note Escrow Account if the Company Senior Note Escrow
Account Agreement has been terminated.

      (d) So long as no Event of Default shall have occurred and be continuing,
and subject to the other terms and conditions hereof and of the Senior Indenture
or of the Convertible Note Indenture if the Senior Notes are no longer
outstanding and the Senior Note Indenture has been satisfied and discharged, the
Leasing Company shall be entitled to receive, and to utilize free and clear of
the Liens of this Security Agreement, all payments ("Unrestricted Payments")
made from time to time with respect to Intercompany Notes not described in
Section 7(b) above ("Unrestricted Collateral"), whether interest, principal,
dividends, distributions or otherwise.

      (e) The Collateral Agent and/or the Senior Note Trustee (or the
Convertible Note Trustee if the Senior Notes are no longer outstanding and the
Senior Note Indenture has been satisfied and discharged) shall execute and
deliver (or cause to be executed and delivered) to the Leasing Company all such
proxies and other instruments as the Leasing Company may reasonably request for
the purpose of enabling the Leasing Company to exercise the voting and other
rights that it is entitled to exercise pursuant to Section 7(a) above.

      (f) Upon the occurrence and during the continuance of an Event of Default,
(i) all rights of the Leasing Company to exercise the voting and other
consensual rights that it would otherwise be entitled to exercise pursuant to
Section 7(a) shall cease, and all such rights shall thereupon become vested in
the Collateral Agent on behalf of, or if necessary, directly in, the Senior Note
Trustee (or the Convertible Note Trustee if the Senior Notes are no longer
outstanding and the Senior Note Indenture has been satisfied and discharged),
which shall thereupon have the sole right to exercise such voting and other
consensual rights, and (ii) all Unrestricted Payments shall constitute
Collateral and shall be paid directly to the Collateral Agent and the Leasing
Company's right to receive such payments pursuant to Section 7(c) hereof shall
immediately cease and all such Unrestricted Payments shall be deposited in the
Leasing


                                       11
<PAGE>   12
Company Senior Note Escrow Account or the Leasing Company Convertible Note
Escrow Account, if the Leasing Company Senior Note Escrow Account has been
terminated.

      (g) Upon the occurrence and during the continuance of an Event of Default,
the Leasing Company shall execute and deliver (or cause to be executed and
delivered) to the Collateral Agent and/or the Senior Note Trustee (or the
Convertible Note Trustee if the Senior Notes are no longer outstanding and the
Senior Note Indenture has been satisfied and discharged) all such proxies and
other instruments as the Collateral Agent and/or the applicable Trustee may
reasonably request for the purpose of enabling the Collateral Agent and/or the
applicable Trustee to exercise the voting and other rights that it is entitled
to exercise pursuant to Section 7(c) above.

      (h) All lease payments and rents, all interest and principal payments, all
dividends and distributions and all other payments that are received by the
Leasing Company contrary to the provisions of this Section 7 shall be received
in trust for the Collateral Agent for the benefit of the Senior Note Trustee and
the equal and ratable benefit of the Holders of the Senior Notes and for the
benefit of the Convertible Note Trustee and the equal and ratable benefit of the
Holders of the Convertible Notes, shall be segregated from the other property or
funds of the Leasing Company and be forthwith delivered to the Collateral Agent
as Collateral in the same form as so received (with any necessary endorsements
or other instruments of transfer or assignment in blank), and all such payments
shall be deposited in the Leasing Company Escrow Account or the Company
Convertible Note Escrow Account if the Leasing Company Escrow Account Agreement
has been terminated.

      (i) So long as no Event of Default shall have occurred and be continuing,
neither the Collateral Agent nor the Trustees shall be under any obligation to
collect, attempt to collect, protect or enforce the Collateral, which the
Leasing Company agrees and undertakes to do at the Leasing Company's expense;
provided that the Collateral Agent and the Trustees shall cooperate with the
Leasing Company and take all such action as the Leasing Company may reasonably
request to permit the Leasing Company to collect, protect or enforce the
Collateral. All reasonable expenses (including, without limitation, attorneys'
fees and legal expenses) actually incurred or paid by the Collateral Agent and
the Trustees in connection with or incident to any such collection or attempt to
collect, protect or enforce the Collateral shall be borne by the Leasing Company
or reimbursed by the Leasing Company to the Collateral Agent or the applicable
Trustee upon demand.

      (j) At the Collateral Agent's or the applicable Trustee's option,
exercisable upon and during the continuance of any Event of Default, either the
Collateral Agent or the Senior Note Trustee (or the Convertible Note Trustee if
the Senior Notes are no longer outstanding and the Senior Note Indenture has
been satisfied and discharged) may notify the lessees and other obligors under
the Telecommunications Asset Agreements, the issuers or other obligors of the
Intercompany Notes constituting Collateral (including Unrestricted Collateral),
the Issuers and the obligors of the Qualified Investments constituting
Collateral that any and all

                                       12
<PAGE>   13
payments and distributions to be made on such Telecommunications Asset
Agreements, such Intercompany Notes and such Qualified Investments, whether
consisting of Unrestricted Collateral or otherwise, shall be made directly to
the Collateral Agent or the applicable Trustee, and the Leasing Company hereby
directs the obligors and lessees of such Telecommunications Asset Agreements,
the obligors of such Intercompany Notes, the Issuers, and the issuers or other
obligors of such Qualified Investments to pay and deliver over to the Collateral
Agent or the Senior Note Trustee (or the Convertible Note Trustee if the Senior
Notes are no longer outstanding and the Senior Note Indenture has been satisfied
and discharged) all payments and distributions to be made on such Intercompany
Notes, and such Qualified Investments, until such obligors or issuers are
notified in writing by the applicable Trustee or the Collateral Agent to
discontinue making such payments to it; and such obligors and issuers shall not
be required to see to the application of said proceeds by the Trustee or the
Collateral Agents. All such payments shall be deposited by such Trustee or the
Collateral Agent into the Leasing Company Escrow Account (or the Convertible
Note Escrow Account if the Leasing Company Note Escrow Account Agreement has
been terminated) and held as additional Collateral for the Obligations. If at
any time the Collateral Agent or a Trustee shall have notified such lessees,
issuers and obligors to make all payments directly to the Collateral Agent and
if any at any time thereafter all Events of Default shall thereafter have been
cured or waived in accordance with the terms of the Senior Note Indenture (or
the Convertible Note Indenture if the Senior Notes are no longer outstanding and
the Senior Note Indenture has been satisfied and discharged), the Collateral
Agent or a Trustee may notify such lessees, issuers and obligors to make all
such payments directly to the Leasing Company or as the Leasing Company may
otherwise direct.

      SECTION 8. POWER OF ATTORNEY. In addition to all of the powers granted to
the Senior Note Trustee pursuant to Article VI of the Senior Note Indenture and
the Convertible Note Trustee pursuant to Article VI of the Convertible Note
Indenture, the Leasing Company hereby appoints and constitutes the Collateral
Agent and the Trustees, whether acting separately or jointly, as the Leasing
Company's attorneys-in-fact to exercise all of the following powers upon and at
any time after the occurrence and during the continuance of an Event of Default:
(i) collection of proceeds of any Collateral; (ii) conveyance of any item of
Collateral to any purchaser thereof; (iii) giving of any notices or recording
of the security interest and the Liens under Section 6(d) hereof; (iv) making of
any payments or taking any acts under Section 9 hereof and (v) paying or 
discharging taxes or Liens levied or placed upon the Collateral, the legality or
validity thereof and the amounts necessary to discharge the same to be
determined by the Collateral Agent in its sole discretion, and such payments
made by the Collateral Agent to become the Obligations of the Leasing Company to
the Collateral Agent, due and payable immediately upon demand. The Collateral
Agent's authority hereunder shall include, without limitation, the authority to
endorse and negotiate any checks or instruments representing proceeds of
Collateral in the name of the Leasing Company, to execute and give receipt for
any certificate of ownership or any document constituting Collateral, to
transfer title to any item of Collateral, to sign the Leasing Company's name on
all financing statements (to the extent permitted by applicable law) or any
other Senior Note Collateral Documents or other documents deemed necessary or
appropriate by the Collateral Agent to preserve, protect or perfect the Liens


                                       13
<PAGE>   14
in the Collateral and to file the same, to prepare, file and sign the Leasing
Company's name on any notice of Lien, and to prepare, file and sign the Leasing
Company's name on a proof of claim in bankruptcy or similar document against any
customer of, or person obligated upon any Collateral to, the Leasing Company,
and to take any other actions arising from or incident to the powers granted to
the Collateral Agent in this Security Agreement. This power of attorney is
coupled with an interest in the Trustees and in the Collateral Agent as agent on
behalf of the Trustees and is irrevocable by the Leasing Company.

      SECTION 9. COLLATERAL AGENT OR TRUSTEES MAY PERFORM. If the Leasing 
Company fails to perform any covenant or agreement contained herein, the
Collateral Agent or either Trustee may, but shall not be obligated to, itself
perform, or cause performance of, such covenant or agreement, and the reasonable
expenses of the Collateral Agent or the Trustees incurred in connection
therewith shall be payable by the Leasing Company under Section 17(p) hereof.

      SECTION 10. NO ASSUMPTION OF DUTIES; REASONABLE CARE. The rights and
powers granted to the Collateral Agent or the Trustees hereunder are being
granted in order to preserve and protect the Collateral Agent's Liens and
security interest in and to the Collateral granted hereby and shall not be
interpreted to, and shall not, impose any duties on the Collateral Agent or the
Trustees in connection therewith. Each of the Collateral Agent and the Trustees
shall be deemed to have exercised reasonable care in the custody and
preservation of the Collateral in its possession if the Collateral is accorded
treatment substantially equal to that which the Collateral Agent or such Trustee
accords similar property in similar situations, it being understood that the
Collateral Agent and the Trustees shall not have any responsibility for (i)
ascertaining or taking action with respect to calls, conversions, exchanges,
maturities, tenders or other matters relative to any Collateral, whether or not
the Collateral Agent or either Trustee has or is deemed to have knowledge of
such matters, (ii) taking any necessary steps to preserve rights against any
parties with respect to any Collateral, or (iii) inquiring into or verifying
that the Leasing Company has complied or will comply with its duty to furnish
additional items of Collateral to the Collateral Agent and/or the Trustees
pursuant to Section 6(d) hereof. Absent knowledge to the contrary, the
Collateral Agent and both Trustees may assume that the items of Collateral
actually delivered to it are all items required to be so delivered and may 
assume that no other such items need be so delivered.

      SECTION 11. SUBSEQUENT CHANGES AFFECTING COLLATERAL. The Leasing Company
represents to the Collateral Agent, the Senior Note Trustee and the Holders of
the Senior Notes, and the Convertible Note Trustee and the Holders of the
Convertible Notes that the Leasing Company has made its own arrangements for
keeping informed of changes or potential changes affecting the Collateral
(including but not limited to, compliance with the covenants and the
occurrence of events of default under Telecommunications Asset Agreements and
the status of the related Telecommunications Assets, rights to convert, rights
to subscribe, payment of dividends, payments of interest and/or principal,
reorganization or other exchanges, tender offers and voting rights), and the
Leasing Company agrees that the Collateral Agent, the Senior Note

                                       14
<PAGE>   15
Trustee and the Holders of the Senior Notes, and the Convertible Note Trustee
and the Holders of the Convertible Notes shall have no responsibility or
liability for informing the Leasing Company of any such changes or potential
changes or for taking any action or omitting to take any action with respect
thereof. The Leasing Company will defend the right, title and interest of the
Collateral Agent, the Senior Note Trustee and the Holders of the Senior Notes,
and the Convertible Note Trustee and the Holders of the Convertible Notes in and
to the Collateral against the claims and demands of all persons.

      SECTION 12. REMEDIES UPON AN EVENT OF DEFAULT.

      (a) Upon the occurrence and during the continuance of an Event of Default,
the Collateral Agent may, subject to the provisions of the Senior Note Indenture
(or of the Convertible Note Indenture if the Senior Notes are no longer
outstanding and the Senior Note Indenture has been satisfied and discharged),
this Security Agreement, and the Collateral Agent's and the Trustees' compliance
with any requirements of law (including, without limitation, the applicable
Uniform Commercial Code and the Personal Property Security Act (Ontario))
applicable to the action to be taken, without notice to or demand upon the
Leasing Company except as required by the Senior Note Indenture, the Convertible
Note Indenture, this Agreement or applicable law, do any one or more of the
following:

          (i) exercise any or all of the rights and remedies provided for by the
applicable Uniform Commercial Code and the Personal Property Security Act
(Ontario), specifically including, without limitation, the right to recover the
reasonable fees and expenses incurred by the Collateral Agent or the Trustees in
the enforcement of this Security Agreement or in connection with the Leasing
Company's redemption of the Collateral, including reasonable fees, expenses and
disbursements of attorneys, paralegals and agents;

          (ii) at its option, transfer or register, and the Leasing Company
shall register or cause to be registered upon request therefor by the Collateral
Agent or the Trustees, the Collateral or any part thereof on the books of the
Restricted Subsidiary or Qualified Joint Venture which is a lessee or buyer in a
transaction in which the monetary consideration therefor is paid immediately or
is payable over time under a Telecommunications Asset Agreement, the Persons in
whom Qualified Investments are made or the Restricted Subsidiaries to which an
intercompany loan evidenced by an Intercompany Note has been made, into the name
of the Collateral Agent or the Collateral Agent's nominee(s);

          (iii) personally, or by agents or attorneys, immediately retake
possession of the Collateral or the Telecommunications Assets subject to a
Telecommunications Asset Agreement, or any part thereof, from the Leasing
Company or any other Person who then has possession of any part thereof with or
without notice or process of law, and for that purpose may enter upon the
Leasing Company's premises where any of the Collateral is located and remove the
same and use in connection with such removal any and all services, supplies,
aids and other facilities of the Leasing Company;


                                       15
<PAGE>   16
      (iv) sell, assign or otherwise liquidate, or direct the Leasing Company to
sell, assign or otherwise liquidate, any or all of the Collateral or any part
thereof, and take possession of the proceeds of any such sale or liquidation;

      (v) require the Leasing Company to assemble the Collateral or the
Telecommunications Assets subject to a Telecommunications Asset Agreement or any
part thereof and make it available at one or more places as the Collateral Agent
or the Trustees may designate and to deliver possession of the Collateral or any
part thereof to the Collateral Agent or the Trustees;

      (vi) use, in connection with any assembly, use or disposition of the
Collateral, any intellectual property, intangibles or other technical knowledge
or process used or utilized from time to time by the Leasing Company;

      (vii) sell or cause the same to be sold at any broker's board or at public
or private sale, in one or more sales or lots, at such price or prices as the
Collateral Agent may deem best, for cash or on credit or for future delivery,
without assumption of any credit; and the purchaser of any or all Collateral so
sold shall thereafter hold the same absolutely, free from any claim, encumbrance
or right of any kind whatsoever;

      (viii) enforce one or more remedies hereunder, successively or
concurrently, and such action shall not operate to estop or prevent the
Collateral Agent from pursuing any other or further remedy which it may have,
and any repossession or retaking or sale of the Collateral pursuant to the terms
hereof shall not operate to release the Leasing Company until full and final
payment of any deficiency has been made in cash;

      (ix) in connection with any public or private sale under the applicable
Uniform Commercial Code, the Personal Property Act (Ontario) or other
applicable legislation, the Collateral Agent shall give the Leasing Company at
least fifteen (15) Business Days' prior written notice of the time and place of
any public sale of its Collateral or of the time after which any private sale or
other intended disposition thereof may be made, which shall be deemed to be
reasonable notice of such sale or other disposition. Such notice may be given to
the Leasing Company in accordance with the provisions of Section 17(a) hereof;

      (x) proceed by an action or actions at law or in equity to recover the
Obligations or to foreclose this Security Agreement and sell the Collateral, or
any portion thereof, pursuant to a judgment or decree of a court or courts of
competent jurisdiction;

      (xi) exercise any other rights and remedies provided by applicable law and
the other Senior Note Collateral Documents; and

      (xii) if the Collateral Agent recovers possession of all or any part of
the Collateral pursuant to a writ of possession or other judicial process,
whether prejudgment or


                                       16
<PAGE>   17
otherwise, the Collateral Agent may thereafter retain, sell or otherwise dispose
of such Collateral in accordance with this Security Agreement or the applicable
Uniform Commercial Code, the Personal Property Act (Ontario) or other applicable
legislation, and following such retention, sale or other disposition, the
Collateral Agent may voluntarily dismiss without prejudice the judicial action
in which such writ of possession or other judicial process was issued. The
Leasing Company hereby consents to the voluntary dismissal by the Collateral
Agent of such judicial action, and the Leasing Company further consents to the 
exoneration of any bond that the Collateral Agent files in such action.

      (b) If the Collateral Agent shall determine, or shall be directed by the
Senior Note Trustee (or the Convertible Note Trustee if the Senior Notes are no
longer outstanding and the Senior Note Indenture has been satisfied and
discharged), to exercise its right to sell any or all of the Qualified
Investments pursuant to Section 12(a) above, and if in the opinion of counsel
for the Collateral Agent it is necessary, or if in the opinion of the Collateral
Agent or such Trustee it is advisable, after such consultation with investment
bank(s), broker-dealer(s) or other experts selected by them, as the Collateral
Agent or such Trustee deems advisable or appropriate, to have the Qualified
Investments constituting Collateral or that portion thereof to be sold,
registered under the provisions of the Securities Act of 1933, as amended (the
"Securities Act"), the Leasing Company will (i) use its best efforts to cause
the issuer or obligor to execute and deliver, and to cause such Person's
directors and officers to execute and deliver, all at the Leasing Company's own
expense, all such instruments and documents, and to do or cause to be done all
such other acts and things as may be necessary or, in the opinion of the
Collateral Agent or such Trustee, after such consultation with investment
bank(s), broker-dealer(s) or other experts selected by them, as the Collateral
Agent or such Trustee deems advisable or appropriate, advisable to register such
Qualified Investments constituting Collateral under the provisions of the
Securities Act, (ii) use its best efforts to cause the registration statement
relating thereto to become effective and to remain effective for a period of 180
days from the date of the first public offering of such Qualified Investments,
or that portion thereof to be sold and (iii) make all amendments thereto and/or
to the related prospectus that are necessary or, in the opinion of the
Collateral Agent or such Trustee, are advisable, all in conformity with the
requirements of the Securities Act and the rules and regulations of the
Securities and Exchange Commission applicable thereto. The Leasing Company
agrees to use its best efforts to cause the applicable issuer or obligor to
comply with the provisions of the securities or "Blue Sky" laws of any
jurisdiction that the Collateral Agent or the Senior Note Trustee (or the
Convertible Note Trustee if the Senior Notes are no longer outstanding and the
Senior Note Indenture has been satisfied and discharged) shall designate for the
sale of such Qualified Investments and to make available to the security holders
of such issuer or obligor, as the case may be, as soon as practicable, an
earnings statement (which need not be audited) that will satisfy the provisions
of Section 11(a) of the Securities Act. The Leasing Company will cause the
issuer or obligor, as the case may be, to furnish to the Collateral Agent and
the Trustees such number of copies as the Collateral Agent and the Trustees may
reasonably request of each preliminary prospectuses and prospectuses, to notify
promptly the Collateral Agent and the Trustees of the happening of any event as
a result of which any then effective prospectus includes an untrue statement of
any material fact or omits to


                                       17
<PAGE>   18
state a material fact required to be stated therein or necessary to make the
statements therein not misleading in the light of then existing circumstances
and cause the Collateral Agent and the Trustees to be furnished with such number
of copies as the Collateral Agent or the Trustees may request of such supplement
to or amendment of such prospectus as is necessary to eliminate such untrue
statement or supply such omission. The Leasing Company will cause the issuer or
obligor, as the case may be, to the extent permitted by law, to indemnity,
defend and hold harmless the Collateral Agent, the Senior Note Trustee and the
Holders of the Senior Notes, and the Convertible Note Trustee and the Holders of
the Convertible Notes from and against all losses, liabilities, expenses or
claims (including reasonable costs of investigation) that the Collateral Agent,
the Senior Note Trustee and the Holders of the Senior Notes, and the Convertible
Note Trustee and the Holders of the Convertible Notes may incur under the
Securities Act or otherwise, insofar as such losses, liabilities, expenses or
claims arise out of or are based upon any alleged untrue statement of a material
fact contained in such registration statement (or any amendment thereto) or in
any preliminary prospectus or prospectus (or any amendment or supplement
thereto), or arise out of or are based upon any alleged omission to state a
material fact required to be stated therein or necessary to make the statements
therein not misleading, except to the extent that any such losses, liabilities,
expenses or claims arise solely out of or are based solely upon any such alleged
untrue statement made or such alleged omission to state a material fact included
or excluded on the written direction of the Collateral Agent or such Trustee.
The Leasing Company will bear, or will cause the issuer or obligor, as the case
may be, to bear, all costs and expenses of carrying out its or their obligations
hereunder. The provisions of this Section 12(b) shall in no way impose upon
either Trustee or the Collateral Agent any duty to execute any registration
statement under the Securities Act with respect to any Qualified Investment.

      (c) In view of the fact that federal, state and foreign securities laws
may impose certain restrictions on the method by which a sale of the Collateral
may be effected after an Event of Default, the Leasing Company agrees that upon
the occurrence and during the continuance of an Event of Default, the Collateral
Agent may, from time to time, attempt to sell all or any part of the Collateral
by means of a private placement, restricting the prospective purchasers to those
who will represent and agree that they are purchasing for investment only and
not for distribution. In so doing, the Collateral Agent may solicit, or may
cause an investment manager to solicit, offers to buy the Collateral, or any
part of it, for cash, from a limited number of investors who might be interested
in purchasing the Collateral. The Leasing Company acknowledges and agrees that
any such private sale may result in prices and terms less favorable than if such
sale were a public sale and, notwithstanding such circumstances, agrees that any
such private sale shall be deemed to have been made in a commercially reasonable
manner. The Collateral Agent shall be under no obligation to delay a sale of any
of the Collateral for the period of time necessary to permit the Leasing Company
to cause the issuer or obligor to register such securities for public sale under
the Securities Act, or under applicable state or foreign securities laws, even
if the Leasing Company could cause the issuer or obligor, as the case may be, to
do so.

                                       18
<PAGE>   19
      (d) The Leasing Company further agrees to use its best efforts to do or
cause to be done all such other acts as may be necessary to make such sale or
sales of all or any portion of the Collateral pursuant to this Section 12 valid
and binding and in compliance with any and all other applicable requirements of
applicable law. The Leasing Company further agrees that a breach of any of the
covenants contained in this Section 12 will cause irreparable injury to the
Senior Note Trustee and the Holders of the Senior Notes, and the Convertible
Note Trustee and the Holders of the Convertible Notes and that the Collateral
Agent, the Senior Note Trustee and the Holders of the Senior Notes and the
Convertible Note Trustee and the Holders of the Convertible Notes have no
adequate remedy at law in respect of such breach and, as a consequence, that
each and every covenant contained in this Section 12 shall be specifically
enforceable against the Leasing Company, and the Leasing Company hereby waives
and agrees not to assert any defenses against an action for specific performance
of such covenants except for a defense that no Event of Default has occurred and
is continuing.

      (e) Any cash held by the Collateral Agent as Collateral and all cash
proceeds received by the Collateral Agent in respect of any sale of, collection
from, or other realization upon all or any part of the Collateral shall be
applied by the Collateral Agent:

            First, to the payment of the costs and expenses of such sale,
      including, without limitation, reasonable expenses of the Collateral Agent
      and its agents including the fees and expenses of its counsel, and all
      expenses, liabilities and advances made or incurred by the Collateral
      Agent in connection therewith or pursuant to Section 17(p) hereof:

            Next, to the Senior Note Trustee for the payment in full of all
      amounts due under Section 7.7 of the Senior Note Indenture;

            Next, to the Senior Note Trustee, for distribution to the Holders of
      the Senior Notes for the payment in full of the remaining Senior Note
      Obligations;

            Next, to the Convertible Note Trustee for the payment in full of all
      amounts due under Section 7.7 of the Convertible Note Indenture.

            Next, to the Convertible Note Trustee, for distribution to the
      Holders of the Convertible Notes, for the payment in full of the remaining
      convertible Note Obligations; and

            Finally, after payment in full of all of the Obligations, to the
      Company, or its successors or assigns, or to whomsoever may be lawfully
      entitled to receive the same as a court of competent jurisdiction may
      direct.

      (f) If any sale or other disposition of Collateral by the Collateral Agent
or any other action of the Collateral Agent or the Trustees hereunder results in
reduction of the


                                       19
<PAGE>   20
Obligations, such action will not release the Leasing Company from its liability
for any unpaid Obligations, including costs, charges and expenses incurred in
the liquidation of Collateral, together with interest thereon, and the same
shall be immediately due and payable to the Collateral Agent, the Senior Note
Trustee and the Holders of the Senior Notes as provided for in the Senior Note
Indenture, or, if applicable, the Convertible Note Trustee and the Holders of
the Convertible Notes as provided for in the Convertible Note Indenture.

      (g) The Collateral Agent may enforce its rights hereunder without prior
judicial process or judicial hearing, and to the extent permitted by law the
Leasing Company expressly waives any and all legal rights which might otherwise
require the Collateral Agent to enforce its right by judicial process.

      (h) The existence and/or exercise of any or all of the rights and remedies
given to the Collateral Agent and/or either Trustee under this Section 12 shall
be subject in all cases to compliance with any mandatory requirements of
applicable law, particularly the laws of jurisdictions other than the United
States.

      SECTION 13. IRREVOCABLE AUTHORIZATION AND INSTRUCTIONS TO THE APPLICABLE
ISSUER. The Leasing Company hereby authorizes and instructs the lessees, issuers
and obligors to comply with any instructions received by the Issuers or such
other issuer or obligor, as the case may be, from the Collateral Agent or the
Senior Note Trustee (or the Convertible Note Trustee if the Senior Notes are no
longer outstanding and the Senior Note Indenture has been satisfied and
discharged) that (i) states that an Event of Default has occurred and (ii) is
otherwise in accordance with the terms of this Security Agreement, without any
other or further instructions from the Leasing Company, and the Leasing Company
agrees that the lessees, issuers and obligors shall be fully protected in so
complying.

      SECTION 14. ESCROW ACCOUNTS. All money received by the Leasing Company and
required to be deposited in the Leasing Company Escrow Account, or the
Convertible Note Escrow Account if the Leasing Company Escrow Account Agreement
has been terminated, shall be promptly and without commingling remitted to the
Collateral Agent or the Senior Note Trustee (or the Convertible Note Trustee if
the Senior Notes are no longer outstanding and the Senior Note Indenture has
been satisfied and discharged) for deposit therein. Amounts held in the Leasing
Company Escrow Account shall be applied or disposed of only in a manner not
prohibited by the Senior Note Indenture.

      SECTION 15. SECURITY INTEREST ABSOLUTE. All rights of the Collateral
Agent, the Senior Note Trustee and the Holders of the Senior Notes, and the
Convertible Note Trustee and the Holders of the Convertible Notes and the Liens
or security interests hereunder, and all obligations of the Leasing Company
hereunder, shall be absolute and unconditional irrespective of:


                                       20
<PAGE>   21
         (a) any lack of validity or enforceability of the Senior Note
Indenture, any Senior Note Collateral Document, any Senior Note Guarantee, the
Convertible Note Indenture, any Convertible Note Collateral Document, any
Convertible Note Guarantee or any other agreement or instrument relating
thereto;

         (b) any change in the time, manner or place of payment of, or in any
other term of, all or any of the Obligations, or any other amendment or waiver
of or any consent to any departure from the Senior Note Indenture or the Senior
Note Collateral Documents or from the Convertible Note Indenture or the
Convertible Note Collateral Documents;

         (c) any exchange, surrender, release or non-perfection of any Liens on
any other collateral, or any release or amendment or waiver of or consent to
departure from any Senior Note Guarantee, any Convertible Note Guarantee or
other guarantee, for all or any of the Obligations; or

         (d) any other circumstance which might otherwise constitute a defense
available to, or a discharge of, the Leasing Company in respect of the
Obligations or of this Security Agreement.

         SECTION 16. WAIVERS.

         (a) Except as may be required under the provisions of the Senior Note
Indenture (or of the Convertible Note Indenture if the Senior Notes are no
longer outstanding and the Senior Note Indenture has been satisfied and
discharged) and to the fullest extent permitted under applicable law, neither
the Collateral Agent nor the Senior Note Trustee (or the Convertible Note
Trustee if the Senior Notes are no longer outstanding and the Senior Note
Indenture has been satisfied and discharged) shall be under any duty whatsoever
to make or give any presentment, notice of dishonor, protest, demand for
performance, notice of non-performance, notice of intent to accelerate, notice
of acceleration, or other notice or demand in connection with any Collateral or
the Obligations, or to take any steps reasonably necessary to preserve any
rights against any Obligor or other Person. The Leasing Company waives to the
fullest extent permitted under applicable law any right of marshalling in
respect of any and all Collateral, and waives to the fullest extent permitted
under applicable law any right to require the Collateral Agent or the applicable
Trustee to proceed against any Obligor or other Person, exhaust any Collateral
or enforce any other remedy which the Collateral Agent or the applicable Trustee
now has or may hereafter have against any Obligor or other Person.

         (b) The Leasing Company waives to the fullest extent permitted under
applicable law (i) any and all notices of acceptance, creation, modification,
rearrangement, renewal or extension for any period of any instrument executed by
any obligor in connection with the Obligations and (ii) any defense of any
Obligor by reason of disability, lack of authorization, cessation of the
liability of any Obligor or for any other reason. The Leasing Company authorizes
the Collateral Agent to the fullest extent permitted under applicable law,

                                       21
<PAGE>   22
without notice or demand and without any reservation of rights against the
Leasing Company and without affecting the Leasing Company's liability hereunder
or on the Obligations, from time to time to (w) take and hold other Property,
other than the Collateral, as security for the Obligations, and exchange,
enforce, waive and release any or all of the Collateral, (x) after the
occurrence and during the continuance of an Event of Default and the
acceleration of the Senior Notes, apply the Collateral in the manner permitted
by this Security Agreement or the Senior Note Indenture, (y) after the
occurrence and during the continuance of an Event of Default and the
acceleration of the Convertible Notes if the Senior Notes are no longer
outstanding and the Senior Note Indenture has been satisfied and discharged,
apply the Collateral in the manner permitted by this Security Agreement or the
Convertible Note Indenture and (z) after the occurrence and during the
continuance of an Event of Default renew, extend for any period, accelerate,
amend or modify, supplement, enforce, compromise, settle, waive or release the
obligations of any obligor on, or any instrument or agreement of such other
Person with respect to any or all of, the Collateral.

         SECTION 17. MISCELLANEOUS PROVISIONS.

         (a) Notices.  All notices, approvals, consents or other communications
required or desired to be given hereunder shall be in the form and manner, and
delivered to the Leasing Company, at its address as set forth in Section 13.2 of
the Senior Note Indenture, to the Senior Note Trustee at its address as set
forth in Section 13.2 of the Senior Note Indenture, to the Convertible Note
Trustee at its address as set forth in Section 13.2 of the Convertible Note
Indenture and to the Collateral Agent at The Bank of New York, 101 Barclay
Street, Floor 21 West, New York, New York 10286.

         (b) Sales of Collateral. No sales of Collateral may be made in
contravention of the terms of the Senior Note Indenture or the Convertible Note
Indenture and the cash proceeds of the sale of any Collateral shall be promptly
and without commingling remitted to the Collateral Agent or the Senior Note
Trustee for deposit in the Leasing Company Escrow Account, or to the Collateral
Agent or the Convertible Note Trustee for deposit in the Convertible Note Escrow
Account if the Leasing Company Escrow Account Agreement has been terminated.

         (c) No Adverse Interpretation of Other Agreements. This Security
Agreement may not be used to interpret another pledge, security or debt
agreement of the Leasing Company or any Subsidiary of the Leasing Company. No
such pledge, security or debt agreement may be used to interpret this Security
Agreement.

         (d) Severability.  The provisions of this Security Agreement are
severable, and if any clause or provision shall be held invalid, illegal or
unenforceable in whole or in part in any jurisdiction, then such invalidity or
unenforceability shall affect in that jurisdiction only such clause or
provision, or part thereof, and shall not in any manner affect such clause or
provision in

                                       22
<PAGE>   23
any other jurisdiction or any other clause or provision of this Security
Agreement in any jurisdiction.

         (e) Headings. The headings in this Security Agreement have been
inserted for convenience of reference only, are not to be considered a part
hereof and shall in no way modify or restrict any of the terms or provisions
hereof.

         (f) Counterpart Originals. This Security Agreement may be signed in two
or more counterparts, each of which shall be deemed an original, but all of
which shall together constitute one and the same agreement.

         (g) Benefits of Security Agreement. Nothing in this Security Agreement,
express or implied, shall give to any person, other than the parties hereto and
their successors hereunder and the Holders of the Senior Notes and the Senior
Note Guarantors and the Holders of the Convertible Notes and the Convertible
Note Guarantors, any benefit or any legal or equitable right, remedy or claim
under this Security Agreement.

         (h) Amendments, Waivers and Consents. Any amendment or waiver of any
provision of this Security Agreement and any consent to any departure by the
Leasing Company from any provision of this Security Agreement shall be effective
only if made or given in compliance with all of the terms and provisions of the
Senior Note Indenture and the Convertible Note Indenture and neither the
Collateral Agent or the Senior Note Trustee nor any Holder of any Senior Note or
the Convertible Note Trustee or any Holder of any Convertible Note shall be
deemed, by any act, delay, indulgence, omission or otherwise, to have waived any
right or remedy hereunder or to have acquiesced in any Default or Event of
Default or in any breach of any of the terms and conditions hereof. Failure of
the Collateral Agent or the Trustees to exercise, or delay in exercising, any
right, power or privilege hereunder shall not operate as a waiver thereof. No
single or partial exercise of any right, power or privilege hereunder shall
preclude any other or further exercise thereof or the exercise of any other
right, power or privilege. A waiver by the Collateral Agent, the Senior Note
Trustee or any Holder of any Senior Note or the Convertible Note Trustee or any
Holder of any Convertible Note of any right or remedy hereunder on any one
occasion shall not be construed as a bar to any right or remedy that the
Collateral Agent, either Trustee or any such Holder would otherwise have on any
future occasion. The right and remedies herein provided are cumulative, may be
exercised singly or concurrently and are not exclusive of any rights or remedies
provided by law.

         (i) Interpretation of Security Agreement. All terms not defined herein
or in the Senior Note Indenture shall have the meaning set forth in the
applicable Uniform Commercial Code of the State of New York, except where the
context otherwise requires. To the extent a term or provision of this Security
Agreement conflicts with the Senior Note Indenture, the Senior Note Indenture
shall control with respect to the subject matter of such term or provision.
Acceptance of or acquiescence in a course of performance rendered under this
Security Agreement shall not be relevant in determining the meaning of this
Security Agreement


                                       23
<PAGE>   24
even though the accepting or acquiescing party had knowledge of the nature of
the performance and opportunity for objection.

         (j) Continuing Security Interest; Transfer of Collateral. This Security
Agreement shall create a continuing Lien and security interest in the Collateral
and shall (i) unless otherwise provided in the Senior Note Indenture, the
Convertible Note Indenture or this Security Agreement, remain in full force and
effect until payment in full of (A) the Senior Notes under the terms of the
Senior Note Indenture, (B) all Obligations then due and owing under the Senior
Note Indenture, the Senior Note Guarantees and the Senior Note Collateral
Documents, (C) the Convertible Notes under the terms of the Convertible Note
Indenture and (D) all Obligations then due and owing under the Convertible Note
Indenture, the Convertible Note Guarantees and the Convertible Note Collateral
Documents; provided, however, that after receipt from the Leasing Company by the
Collateral Agent of a request for a release of any Collateral permitted under
the Senior Note Indenture and the Convertible Note Indenture upon the sale,
transfer, assignment, exchange or other disposition of such Collateral not
prohibited by the Senior Note Indenture and the Convertible Note Indenture and
upon receipt by the Collateral Agent of all proceeds of such sale, transfer,
assignment, exchange or other disposition required to be remitted to the
Collateral Agent or the Senior Note Trustee (or the Convertible Note Trustee if
the Senior Notes are no longer outstanding and the Senior Note Indenture has
been satisfied and discharged) or the Collateral constituting the proceeds of
such sale, transfer, assignment, exchange or other disposition is made subject
to a Lien and security interest in favor of the Collateral Agent for the benefit
of the Senior Note Trustee and the equal and ratable benefit of the Holders of
the Senior Notes and for the benefit of the Convertible Note Trustee and the
equal and ratable benefit of the Holders of the Convertible Notes, which Lien
has the same priority as had the Lien on the Collateral being sold, assigned or
otherwise disposed of, such Collateral shall be released from the Lien and
security interest created hereunder and no longer constitute Collateral. Upon
the payment in full of (A) the Senior Notes under the terms of the Senior Note
Indenture, (B) all Obligations then due and owing under the Senior Note
Indenture, the Senior Note Guarantees and the Senior Note Collateral Documents,
(C) the Convertible Notes under the terms of the Convertible Note Indenture and
(D) all Obligations then due and owing under the Convertible Note Indenture, the
Convertible Note Guarantees and the Convertible Note Collateral Documents, the
Leasing Company shall be entitled to the return, upon its request and at its
expense, of such of the Collateral pledged by it as shall not have been sold or
otherwise applied pursuant to the terms hereof. This Security Agreement shall be
binding upon the Leasing Company, its successors and assigns, and inure,
together with the rights and remedies of the Trustees hereunder, to the benefit
of the Collateral Agent, the Senior Note Trustee and the Holders of the Senior
Notes, and the Convertible Note Trustee and the Holders of the Convertible Notes
and their respective successors, transferees and assigns.

         (k) Reinstatement. This Security Agreement shall continue to be
effective or be reinstated, as the case may be, if at any time any amount
received by the Collateral Agent, the Senior Note Trustee or any Holder of a
Senior Note or the Convertible Note Trustee or any Holder of a Convertible Note
in respect of the Obligations is rescinded or must otherwise be


                                       24
<PAGE>   25
restored or returned by the Collateral Agent, the Senior Note Trustee or any
Holder of a Senior Note upon the insolvency, bankruptcy, dissolution,
liquidation or reorganization or the Leasing Company or upon the appointment of
any receiver, intervenor, conservator, trustee or similar official for the
Leasing Company or upon the appointment of any receiver, intervenor,
conservator, trustee or similar official for the Leasing Company or any
substantial part of its assets, or otherwise, all as though such payments had
not been made.

         (1) Survival of Provisions. All representations, warranties and
covenants of the Leasing Company contained herein shall survive the execution
and delivery of this Security Agreement, and shall terminate only upon the full
and final payment and performance by the Leasing Company of the Obligations.

         (m) Authority of Collateral Agent and Trustees. Both the Collateral
Agent and the Trustees shall have and be entitled to exercise all powers
hereunder that are specifically granted to the Collateral Agent and the Trustees
by the terms hereof, together with such powers as are reasonably incident
thereto. The Collateral Agent and the Trustees may perform any of their
respective duties hereunder or in connection with the Collateral by or through
agents or employees and shall be entitled to retain counsel and to act in
reliance upon the advice of counsel concerning all such matters. None of the
Collateral Agent, any director, officer, any attorney or agent of the Collateral
Agent, the Senior Note Trustee, any director, officer, employee, attorney or
agent of the Senior Note Trustee, the Holders of the Senior Notes, the
Convertible Note Trustee, any director, officer, employee, attorney or agent of
the Convertible Note Trustee and the Holders of the Convertible Notes shall be
liable to the Leasing Company for any action taken or omitted to be taken by it
or them hereunder, except for its or their own negligence or willful misconduct,
nor shall the Collateral Agent or the Trustees be responsible for the validity,
effectiveness or sufficiency hereof or of any document or security furnished
pursuant hereto. The Collateral Agent and its directors, officers, employees,
attorneys and agents, the Senior Note Trustee and its directors, officers,
employees, attorneys and agents the Convertible Note Trustee, any director,
officer, employee, attorney or agent of the Convertible Note Trustee and the
Holders of the Convertible Notes shall be entitled to rely on any communication,
instrument or document believed by it or them to be genuine and correct and to
have been signed or sent by the proper person or persons. Neither the Collateral
Agent nor the Trustees shall be required to, and shall not, expend or risk any
of its own funds or otherwise incur any financial liability in the performance
of any of its duties hereunder.

         The Leasing Company acknowledges that the rights and responsibilities
of the Collateral Agent and the Trustees under this Security Agreement with
respect to any action taken by the Collateral Agent and the Trustees or the
exercise or non-exercise by the Collateral Agent and the Trustees of any option,
right, request, judgment or other right or remedy provided for herein or
resulting or arising out of this Security Agreement shall, as among the
Collateral Agent, the Senior Note Trustee, the Holders of the Senior Notes, the
Convertible Note Trustee and the Holders of the Convertible Notes, be governed
by the Senior Note Indenture or the Convertible Note Indenture, as applicable
and by such other agreements with respect thereto as


                                       25
<PAGE>   26
may exist from time to time among them, but, as among the Collateral Agent, the
Trustees and the Leasing Company, the Collateral Agent and the Trustees shall be
conclusively presumed to be acting as agent for the Holders of the Senior Notes
or Holders of the Convertible Notes, as the case may be, with full and valid
authority so to act or refrain from acting, and the Leasing Company shall not be
obligated or entitled to make any inquiry respecting such authority.

         In any case in which the Collateral Agent shall be required or
permitted to make any determination as to the extent to which the security
interest or Liens under this Security Agreement secures any obligations, the
Collateral Agent is authorized, without any direction from, or requirement for
consent of or authorization by, the Senior Note Trustee (or the Convertible Note
Trustee if the Senior Notes are no longer outstanding and the Senior Note
Indenture has been satisfied and discharged), to institute proceedings in a
court of competent jurisdiction for the obtaining of any authoritative
determination of such matter. If the Collateral Agent institutes any such
proceeding, it shall give prompt written notice thereof to the Trustees and
shall afford each of them the opportunity to participate in such proceeding.

         (n) Limitation by Law. All rights, remedies and powers provided herein
may be exercised only to the extent that they will not render this Security
Agreement not entitled to be recorded, registered or filed under provisions of
any applicable law.

         (o) Release: Termination of Security Agreement.

                  (i) Subject to the provisions of Section 17(k) hereof, this
Security Agreement shall terminate upon payment in full of (A) the Senior Notes
under the terms of the Senior Note Indenture and (B) all Obligations then due
and owing under the Senior Note Indenture, the Senior Note Guarantees, and the
Senior Note Collateral Documents, (C) the Convertible Notes under the terms of
the Convertible Note Indenture and (D) all Obligations then due and owing under
the Convertible Note Indenture, the Convertible Note Guarantees and the
Convertible Note Collateral Documents, except that the provisions of Section
17(p) hereof shall survive.

                  (ii) The Leasing Company agrees that it will not sell or
dispose of any of the Collateral in violation of the Senior Note Indenture or
the Convertible Note Indenture; provided, however, that if the Leasing Company
shall sell or otherwise dispose of any of the Collateral in accordance with the
terms of the Senior Note Indenture and of the Convertible Note Indenture, the
Collateral Agent shall, and the Trustees shall cause, at the request of the
Leasing Company, release or cause to be released the Collateral subject to such
sale or disposition free and clear of the Liens and security interest under this
Security Agreement.

                  (iii) Upon any termination of this Security Agreement or
release of any Collateral as permitted by the Senior Note Indenture (or the
Convertible Note Indenture if the Senior Notes are no longer outstanding and the
Senior Note Indenture has been satisfied and discharged) the Collateral Agent
and the Trustees will, at the expense of the Leasing Company,


                                       26
<PAGE>   27
execute and deliver to the Leasing Company such documents and take such other
actions as the Leasing Company shall reasonably request to evidence the
termination of this Security Agreement or the release of such Collateral, as the
case may be. Any such action taken by the Collateral Agent or the Trustees shall
be without warranty by or recourse to the Collateral Agent or the Trustees,
except as to the absence of any prior assignments by the Collateral Agent or the
Trustees of its interests in the Collateral, and shall be at the expense of the
Leasing Company. The Collateral Agent and the Trustees may conclusively rely on
any certificate delivered to it by the Leasing Company stating that the
execution of such documents and release of the Collateral is in accordance with
and permitted by the terms of this Security Agreement and the Senior Note
Indenture (or of the Convertible Note Indenture if the Senior Notes are no
longer outstanding and the Senior Note Indenture has been satisfied and
discharged).

         (p) Payment of Fees and Expenses. The Leasing Company will upon demand
pay to the Collateral Agent and the Trustees, without duplication, the amount of
any and all expenses, including, without duplication, the fees and disbursements
of its counsel and of any experts and agents, that the Collateral Agent and the
Trustees may incur in connection with (i) administration of this Security
Agreement, (ii) the custody, preservation, use or operation of, or the sale of,
collection from, or other realization upon, any of the Collateral, (iii) the
exercise or enforcement of any of the rights of the Collateral Agent and the
Trustees hereunder or (iv) the failure by the Leasing Company to perform or
observe any of the provisions hereof. The Leasing Company shall be liable for
and shall reimburse and indemnify both Trustees and the Collateral Agent and
hold both Trustees and the Collateral Agent harmless from and against any and
all claims, losses, liabilities, costs, damages or expenses (including
reasonable attorneys' fees and expenses) (collectively, "Losses") arising from
or in connection with or related to this Agreement or being a Trustee or
Collateral Agent hereunder (including but not limited to Losses incurred by such
Trustee or Collateral Agent in connection with its successful defense, in whole
or in part, of any claim of negligence or willful misconduct in its part),
provided however that nothing contained herein shall require the Trustees and
the Collateral Agent to be indemnified for their respective negligence or
willful misconduct.

         (q) Final Expression. This Security Agreement, together with the Senior
Note Indenture, the Convertible Note Indenture and any other agreement executed
in connection herewith or therewith, is intended by the parties as a final
expression of this Security Agreement and is intended as a complete and
exclusive statement of the terms and conditions hereof.

         (r) Leasing Company Remain Liable. Anything herein to the contrary
notwithstanding, (a) the Leasing Company shall remain liable under any contracts
and agreements included in the Collateral, to the extent set forth therein, to
perform all of its duties and obligations thereunder to the same extent as if
this Security Agreement had not been executed, (b) the exercise by the
Collateral Agent or the Trustees of any of the rights hereunder shall not
release the Leasing Company from any of its duties or obligations under the
contracts and agreements included in the Collateral and (c) the Collateral Agent
and the Trustees shall not have any obligation or liability under any contracts
and agreements included in the Collateral by


                                       27
<PAGE>   28
reason of this Security Agreement, nor shall the Collateral Agent or the
Trustees be obligated to perform any of the obligations or duties of the Leasing
Company thereunder or to take any action to collect or enforce any claim for
payment assigned hereunder.

         (s) Indentures. This Security Agreement is subject to the terms,
conditions and provisions of the Senior Note Indenture, or of the Convertible
Note Indenture if the Senior Notes are no longer outstanding and the Senior Note
Indenture has been satisfied and discharged.

         (t) Where there is a conflict between the provisions of this Security
Agreement and the Senior Note Indenture or the Convertible Note Indenture, as
the case may be, the provisions of the Senior Note Indenture or the Convertible
Note Indenture shall prevail.

         (u) Rights of Holders. No Holder of a Senior Note or of a Convertible
Note shall have any independent rights hereunder other than those rights granted
to individual Holders pursuant to Section 6.7 of the Senior Note Indenture or
Section 6.7 of the Convertible Note Indenture, as the case may be; provided that
nothing in this subsection (t) shall limit any rights granted to the Senior Note
Trustee under the Senior Notes, the Senior Note Indenture or the Senior Note
Collateral Documents or the Convertible Note Trustee under the Convertible
Notes, the Convertible Note Indenture or the Convertible Note Collateral
Documents.

         (v) No Personal Liability of Directors, Officers, Employees and
Stockholders. No past, present or future director, officer, employee,
incorporator or stockholder of the Leasing Company or of any subsidiary of the
Leasing Company, as such, shall have any liability for any obligations of the
Leasing Company under this Security Agreement or for any claim based on, in
respect of, or by reason of, such obligations or their creation.

         (w) GOVERNING LAW; SUBMISSION TO JURISDICTION; WAIVER OF JURY TRIAL;
WAIVER OF DAMAGES

                  (i) THIS SECURITY AGREEMENT SHALL BE GOVERNED BY AND
INTERPRETED UNDER THE LAWS OF THE STATE OF NEW YORK, AND ANY DISPUTE ARISING OUT
OF, CONNECTED WITH, RELATED TO, OR INCIDENTAL TO THE RELATIONSHIP ESTABLISHED
BETWEEN THE LEASING COMPANY, THE COLLATERAL AGENT, THE SENIOR NOTE TRUSTEE AND
THE HOLDERS OF THE SENIOR NOTES AND THE CONVERTIBLE NOTE TRUSTEE AND THE HOLDERS
OF THE CONVERTIBLE NOTES IN CONNECTION WITH THIS SECURITY AGREEMENT, AND WHETHER
ARISING IN CONTRACT, TORT, EQUITY OR OTHERWISE, SHALL BE RESOLVED IN ACCORDANCE
WITH THE INTERNAL LAWS (AS OPPOSED TO THE CONFLICTS OF LAWS PROVISIONS) AND
DECISIONS OF THE STATE OF NEW YORK

                  (ii) THE LEASING COMPANY AGREES THAT THE COLLATERAL AGENT
SHALL, IN ITS CAPACITY AS COLLATERAL AGENT OR IN THE NAME AND ON BEHALF OF THE
SENIOR NOTE TRUSTEE AND ANY HOLDERS


                                       28
<PAGE>   29
OF SENIOR NOTES AND THE CONVERTIBLE NOTE TRUSTEE AND ANY HOLDERS OF CONVERTIBLE
NOTES, AND THE SENIOR NOTE TRUSTEE SHALL, IN ITS CAPACITY AS SENIOR NOTE TRUSTEE
OR IN THE NAME AND ON BEHALF OF ANY HOLDERS OF SENIOR NOTES AND THE CONVERTIBLE
NOTE TRUSTEE SHALL, IN ITS CAPACITY AS CONVERTIBLE NOTE TRUSTEE OR IN THE NAME
AND ON BEHALF OF ANY HOLDERS OF CONVERTIBLE NOTES, HAVE THE RIGHT, TO THE EXTENT
PERMITTED BY APPLICABLE LAW, TO PROCEED AGAINST THE LEASING COMPANY OR ITS
PROPERTY IN A COURT IN ANY LOCATION REASONABLY SELECTED IN GOOD FAITH TO ENABLE
THE COLLATERAL AGENT OR THE TRUSTEES TO REALIZE ON SUCH PROPERTY, OR TO ENFORCE
A JUDGMENT OR OTHER COURT ORDER ENTERED IN FAVOR OF THE COLLATERAL AGENT OR
EITHER TRUSTEE. THE LEASING COMPANY AGREES THAT IT WILL NOT ASSERT ANY
COUNTERCLAIMS, SETOFFS OR CROSS-CLAIMS IN ANY PROCEEDING BROUGHT BY THE
COLLATERAL AGENT OR EITHER TRUSTEE TO REALIZE ON SUCH PROPERTY, OR TO ENFORCE A
JUDGMENT OR OTHER COURT ORDER IN FAVOR OF THE COLLATERAL AGENT OR SUCH TRUSTEE.
THE LEASING COMPANY WAIVES ANY OBJECTION THAT IT MAY HAVE TO THE LOCATION OF THE
COURT IN WHICH EITHER TRUSTEE HAS COMMENCED A PROCEEDING DESCRIBED IN THIS
PARAGRAPH INCLUDING, WITHOUT LIMITATION, ANY OBJECTION TO THE LAYING OF VENUE OR
BASED ON THE GROUNDS OF FORUM NON CONVENIENS.

                  (iii) TO, THE EXTENT PERMITTED BY APPLICABLE LAW, THE LEASING
COMPANY, THE COLLATERAL AGENT AND THE TRUSTEES EACH WAIVE ANY RIGHT TO HAVE A
JURY PARTICIPATE IN RESOLVING ANY DISPUTE, WHETHER SOUNDING IN CONTRACT, TORT,
OR OTHERWISE ARISING OUT OF, CONNECTED WITH, RELATED TO OR INCIDENTAL TO THE
RELATIONSHIP ESTABLISHED BETWEEN THEM IN CONNECTION WITH THIS SECURITY AGREE-
MENT. INSTEAD, ANY DISPUTES RESOLVED IN COURT WILL BE RESOLVED IN A BENCH TRIAL
WITHOUT A JURY.

                  (iv) THE LEASING COMPANY AGREES THAT NONE OF THE COLLATERAL
AGENT, THE SENIOR NOTE TRUSTEE, ANY HOLDER OF A SENIOR NOTE, THE CONVERTIBLE
NOTE TRUSTEE AND ANY HOLDER OF A CONVERTIBLE NOTE SHALL HAVE ANY LIABILITY TO
THE LEASING COMPANY (WHETHER SOUNDING IN TORT, CONTRACT OR OTHERWISE) FOR LOSSES
SUFFERED BY THE LEASING COMPANY IN CONNECTION WITH, ARISING OUT OF, OR IN ANY
WAY RELATED TO, THE TRANSACTIONS CONTEMPLATED AND THE RELATIONSHIP ESTABLISHED
BY THIS SECURITY AGREEMENT, OR ANY ACT, OMISSION OR EVENT OCCURRING IN
CONNECTION THEREWITH, UNLESS IT IS DETERMINED BY A FINAL AND NONAPPEALABLE
JUDGMENT OF A COURT THAT IS BINDING ON THE COLLATERAL AGENT, SUCH TRUSTEE OR
SUCH NOTEHOLDER, AS THE CASE MAY BE, THAT SUCH LOSSES WERE THE RESULT OF ACTS OR
OMISSIONS ON THE


                                       29
<PAGE>   30
PART OF THE COLLATERAL AGENT, THE SENIOR NOTE TRUSTEE OR SUCH HOLDER OF A SENIOR
NOTE OR THE CONVERTIBLE NOTE TRUSTEE OR ANY HOLDER OF A CONVERTIBLE NOTE, AS THE
CASE MAY BE, CONSTITUTING NEGLIGENCE OR WILLFUL MISCONDUCT.

                  (v) THE LEASING COMPANY WAIVES ALL RIGHTS OF NOTICE AND
HEARING OF ANY KIND PRIOR TO THE EXERCISE BY THE SENIOR NOTE TRUSTEE OR ANY
HOLDER OF A SENIOR NOTE OF ITS RIGHTS DURING THE CONTINUANCE OF AN EVENT OF
DEFAULT TO REPOSSESS THE COLLATERAL WITH JUDICIAL PROCESS OR TO REPLEVY, ATTACH
OR LEVY UPON THE COLLATERAL OR OTHER SECURITY FOR THE OBLIGATIONS. THE LEASING
COMPANY WAIVES THE POSTING OF ANY BOND OTHERWISE REQUIRED OF THE COLLATERAL
AGENT, THE SENIOR NOTE TRUSTEE OR ANY HOLDER OF A SENIOR NOTE OR THE CONVERTIBLE
NOTE TRUSTEE OR ANY HOLDER OF A CONVERTIBLE NOTE IN CONNECTION WITH ANY JUDICIAL
PROCESS OR PROCEEDING TO OBTAIN POSSESSION OF, REPLEVY, ATTACH OR LEVY UPON
COLLATERAL OR OTHER SECURITY FOR THE OBLIGATIONS, TO ENFORCE ANY JUDGMENT OR
OTHER COURT ORDER ENTERED IN FAVOR OF THE COLLATERAL AGENT, THE SENIOR NOTE
TRUSTEE OR ANY HOLDER OF A SENIOR NOTE OR THE CONVERTIBLE NOTE TRUSTEE OR ANY
HOLDER OF A CONVERTIBLE NOTE, OR TO ENFORCE BY SPECIFIC PERFORMANCE, TEMPORARY
RESTRAINING ORDER OR PRELIMINARY OR PERMANENT INJUNCTION THIS SECURITY AGREEMENT
OR ANY OTHER AGREEMENT OR DOCUMENT AMONG THE LEASING COMPANY ON THE ONE HAND AND
THE COLLATERAL AGENT, THE SENIOR NOTE TRUSTEE AND/OR THE HOLDERS OF THE SENIOR
NOTES ON THE OTHER HAND.

         (x) Appointment of Collateral Agent. Pursuant to, and subject to the
provisions of, Section 7.12 of the Senior Note Indenture and of Section 7.12 of
the Convertible Note Indenture, the Trustees hereby appoint the Collateral
Agent, and the Collateral Agent accepts appointment, as collateral agent under
the terms of this Security Agreement. The Collateral Agent may resign at any
time by giving written notice thereof to the Trustees and may be removed at any
time with or without cause by the Trustees acting together. Prior to the
effectiveness of any such resignation or removal, the Trustees acting together
shall have the right to appoint a successor Collateral Agent which shall be a
commercial bank organized or chartered under the laws of the United States of
America or any state thereof having combined capital and surplus of at least
$50,000,000. If no successor Collateral Agent shall have been so appointed by
the Trustees acting together, and shall have accepted such appointment within 30
days after the retiring Collateral Agent's giving of notice of resignation or
the Trustee's removal of the retiring Collateral Agent, then the retiring
Collateral Agent shall, prior to the effectiveness of its resignation or
removal, on behalf of the Convertible Note Trustee, the Holders of the
Convertible Notes, the Senior Note Trustee and the Holders of the Senior Notes
appoint a successor Collateral Agent, which shall be a commercial bank organized
under the laws of the United States of America or any state thereof having a
combined capital and surplus of at least


                                       30
<PAGE>   31
$50,000,000. Upon the acceptance of any appointment as Collateral Agent
hereunder by a successor Collateral Agent, such successor Collateral Agent shall
thereupon succeed to and become vested with all the rights, powers, privileges
and duties of the retiring Collateral Agent, and the retiring Collateral Agent
shall be discharged from its duties and obligations under this Security
Agreement. After any retiring Collateral Agent's resignation or removal
hereunder as Collateral Agent, the provisions of this Security Agreement shall
inure to its benefit as to any actions taken or omitted to be taken by it while
it was Collateral Agent under this Security Agreement. Any corporation into
which the Collateral Agency may be merged, or with which it may be consolidated,
or any corporation resulting from any merger or consolidation to which the
Collateral Agent shall be a party, shall be Collateral Agent under this Security
Agreement without the execution or filing of any paper or any further act on the
part of the parties hereto.

                            [SIGNATURE PAGE FOLLOWS]


                                       31
<PAGE>   32
IN WITNESS WHEREOF, the Leasing Company has caused this Security Agreement to be
duly executed and delivered as of the day and year first above written.

                                            PLD CAPITAL ASSET (U.S.) INC.

                                            By:   /s/ E. Clive Anderson
                                                  ------------------------------
                                            Name: E. Clive Anderson
                                                  ------------------------------
                                            Title: Vice President
                                                  ------------------------------
       By its acceptance hereof, as of the day and year first above written, the
Collateral Agent, the Senior Note Trustee and the Convertible Note Trustee agree
to be bound by the provisions hereof.


                                             THE BANK OF NEW YORK, as Collateral
                                                Agent, Senior Note Trustee and
                                                Convertible Note Trustee

                                             By:    /s/ Thomas E. Tabor
                                                  ------------------------------
                                             Name:  Thomas E. Tabor
                                                  ------------------------------
                                             Title: Assistant Vice President
                                                  ------------------------------
<PAGE>   33
                                                              SCHEDULE A
                                                              to Leasing Company
                                                              Security and
                                                              Pledge Agreement

                              QUALIFIED INVESTMENTS

                                      None.
<PAGE>   34
                                                              SCHEDULE B
                                                              to Leasing Company
                                                              Security and
                                                              Pledge Agreement

                       TELECOMMUNICATIONS ASSET AGREEMENTS

                                      None.
<PAGE>   35
                                                              SCHEDULE C
                                                              to Leasing Company
                                                              Security and
                                                              Pledge Agreement

                  EXCEPTIONS TO REPRESENTATIONS AND WARRANTIES

                                      None.
<PAGE>   36
                                                              SCHEDULE D
                                                              to Leasing Company
                                                              Security and
                                                              Pledge Agreement

                          LIENS ON EXISTING COLLATERAL

                                      None.
<PAGE>   37
                                                              SCHEDULE E
                                                              to Leasing Company
                                                              Security and
                                                              Pledge Agreement

                                     FILINGS

                                      None.
<PAGE>   38
                                                              SCHEDULE F
                                                              to Leasing Company
                                                              Security and
                                                              Pledge Agreement

                             CHIEF EXECUTIVE OFFICE


                              c/o PLD Telekom Inc.
                              580 Fifth Avenue
                              New York, NY 10019
<PAGE>   39
                                                              SCHEDULE G
                                                              to Leasing Company
                                                              Security and
                                                              Pledge Agreement

                                 BUSINESS NAMES

                                      None.
<PAGE>   40
                                                              SCHEDULE H
                                                              to Leasing Company
                                                              Security and
                                                              Pledge Agreement

                               LOCATION OF COLLATERAL

The Company's chief executive offices (see Schedule F).
<PAGE>   41
                                                              SCHEDULE I
                                                              to Leasing Company
                                                              Security and
                                                              Pledge Agreement

                     FORM OF ADDITIONAL COLLATERAL AMENDMENT

         This Additional Collateral Amendment, dated         , 19_, is delivered
pursuant to Section 6(a) of the Security Agreement referred to below. The
undersigned hereby pledges to the Collateral Agent for the benefit of the Senior
Note Trustee and the equal and ratable benefit of the Holders of the Senior
Notes and for the benefit of the Convertible Note Trustee and the equal and
ratable benefit of the Holders of the Convertible Notes, and grants to the
Senior Note Trustee for its benefit and the equal and ratable benefit of the
Holders of the Senior Notes and for the benefit of the Convertible Note Trustee
and the equal and ratable benefit of the Holders of the Convertible Notes,
continuing Liens and security interest in all of its rights, title and interest
in the Collateral listed below.

         The undersigned hereby agrees that this Additional Collateral Amendment
may be attached to the Leasing Company Security and Pledge Agreement [PLD
Capital Asset (U.S.) Inc.], dated as of June 15, 1998, between the undersigned
and The Bank of New York, as Senior Note Trustee, Convertible Note Trustee and
as Collateral Agent (the "Security Agreement"); capitalized terms used herein
and not otherwise defined herein shall have the meanings given to such terms in
the Security Agreement; and the Collateral listed on this Additional Collateral
Amendment shall be deemed to be part of the Collateral, and shall become part of
the Collateral and shall secure all Obligations.

                                          PLD CAPITAL ASSET (U.S.) INC.




                                          By:
                                               ---------------------------------
                                          Name:
                                               ---------------------------------
                                          Title:
                                               ---------------------------------
<PAGE>   42
INTERCOMPANY NOTES:

<TABLE>
<CAPTION>
----------------------------------------------------------------------------------
             Description         Name of Restricted                       Original
 Item           of                 Subsidiary                            Principal
Number       Indebtedness          (Obligor)               Date           Amount
----------------------------------------------------------------------------------
<S>             <C>                  <C>                   <C>           <C>


----------------------------------------------------------------------------------
----------------------------------------------------------------------------------

----------------------------------------------------------------------------------
----------------------------------------------------------------------------------

----------------------------------------------------------------------------------
----------------------------------------------------------------------------------

----------------------------------------------------------------------------------
----------------------------------------------------------------------------------

----------------------------------------------------------------------------------
</TABLE>

TELECOMMUNICATIONS ASSET AGREEMENTS:
<TABLE>
<CAPTION>
----------------------------------------------------------------------------
                                                      General
                         Description of            Description of
                        Telecommunications            Leased
 Name of                     Asset              Telecommunications
 Lessee                      Lease                    Assets            Date
----------------------------------------------------------------------------
<S>                     <C>                     <C>                     <C>
----------------------------------------------------------------------------

----------------------------------------------------------------------------
----------------------------------------------------------------------------

----------------------------------------------------------------------------
----------------------------------------------------------------------------

----------------------------------------------------------------------------
----------------------------------------------------------------------------

----------------------------------------------------------------------------
----------------------------------------------------------------------------

----------------------------------------------------------------------------
----------------------------------------------------------------------------

----------------------------------------------------------------------------
</TABLE>
<PAGE>   43
INTERCOMPANY NOTES:
<TABLE>
<CAPTION>
--------------------------------------------------------------------------------------
                                       Name of Restricted                    Original
     Item          Description of          Subsidiary                        Principal
    Number          Indebtedness           (Obligor)          Date             Amount
--------------------------------------------------------------------------------------
<S>               <C>                 <C>                     <C>            <C>

--------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------
</TABLE>

OTHER COLLATERAL:
<TABLE>
<CAPTION>
-----------------------------------------------------------------------------
         Description of
      Qualified Investment
      or other Collateral        Evidenced By         Obligor            Date
-----------------------------------------------------------------------------
<S>                              <C>                  <C>                <C>

-----------------------------------------------------------------------------

-----------------------------------------------------------------------------
-----------------------------------------------------------------------------

-----------------------------------------------------------------------------
-----------------------------------------------------------------------------

-----------------------------------------------------------------------------
-----------------------------------------------------------------------------

-----------------------------------------------------------------------------
-----------------------------------------------------------------------------

-----------------------------------------------------------------------------
-----------------------------------------------------------------------------

-----------------------------------------------------------------------------
</TABLE>
<PAGE>   44
                                                              SCHEDULE J
                                                              to Leasing Company
                                                              Security and
                                                              Pledge Agreement

                             RESTRICTIVE AGREEMENTS

                                     None.