Document:

<PAGE>   1
                                                                  EXHIBIT 10.25

                    TERMINATION OF AIRCRAFT LEASE AGREEMENT

         This Termination of Aircraft Lease Agreement ("Termination") is
entered into as of June 30, 2000 ("Termination Date"), by and between JHS
Leasing of Tampa, Inc. ("Lessor") and Sykes Enterprises, Incorporated
("Lessee").

                                  WITNESSETH:

         WHEREAS, Lessor and Lessee entered into an Aircraft Lease Agreement
dated December 1, 1995 (the "Lease") relating to one 1969 model Gulfstream II
aircraft bearing FAA registration number N718JS (formerly N165U) and
manufacturer's serial number 66, including two (2) Rolls Royce Spoy engines
model MK511-8 (each of which has 750 or more rated takeoff horsepower or its
equivalent), bearing serial numbers 8651 and 8634 (collectively, the
"Aircraft"); and

         WHEREAS, Lessor and Lessee mutually desire to terminate the Lease as
well as any and all other agreements entered into between the parties with
respect to the Aircraft (collectively, the "Aircraft Agreements"), except as
specifically described herein.

         NOW, THEREFORE, in consideration of the premises, promises and
covenants contained herein, and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, Lessor and Lessee
hereby agree as follows:

1.       Termination. The Aircraft Agreements are hereby terminated as of the
         date hereof and the parties shall have no further rights or
         obligations thereunder or arising in connection therewith except as
         specifically described herein.

2.       Termination Fee. Lessee shall pay Lessor the sum of $2,625,269 on the
         Termination Date, and except as set forth below, no other amounts
         shall be due to Lessor from Lessee pursuant to the Lease, and Lessee's
         obligation to pay rent to Lessor shall be terminated as of the
         Termination Date.

3.       Security Deposit. Lessor shall retain the security deposit of
         $96,294.58.

4.       Return Conditions. Lessee shall pay Lessor the sum of $878,000.00 on
         the Termination Date as a partial payment towards the cost of
         complying with the testing, inspection, overhaul and repair
         requirements of Paragraph 10 of the Lease ("Return Conditions").
         Lessee thereunder is responsible to cover certain additional costs
         associated with the return of the Aircraft in an airworthy condition,
         good repair, and working condition capable of performing its
         originally intended use. Lessor understands the Lessee has engaged a
         third party (Gulfstream Aircraft) to perform certain tests to
         determine such additional costs of the Return Conditions and Lessee
         agrees to pay such third party directly for such tests, any cost of
         such required repairs and the transport costs (roundtrip) associated
         with the tests.

5.       Aircraft Expenses. Effective as of the Termination Date, Lessor shall
         assume and pay all personnel and operating costs for the Aircraft,
         including the monthly hangar rental and insurance costs.

6.       Operational Control. Lessor shall be responsible for operational
         control of the Aircraft and risk of loss (including responsibility for
         casualty and liability insurance) as of the Termination Date, and so
         acknowledges by its signature hereon.

7.       Binding Effect. This Termination shall be binding upon and inure to
         the benefit of Lessor and Lessee and their respective successors and
         assigns.

8.       Further Assurances. The parties hereby agree to execute and deliver
         any and all termination statements, releases and other documents as
         may be necessary or appropriate to carry out the purpose and intent of
         this Termination.

                                  Page 1 of 2

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9.       Entire Agreement. This Termination sets forth the entire understanding
         of the parties in connection with the subject matter hereof. There are
         no agreements between Lessor and Lessee relating to the Aircraft other
         than those set forth herein. Neither party hereto has relied upon any
         understanding, representation or warranty not set forth herein, either
         oral or written, as an inducement to enter into this Termination.

10.      Counterparts; Fax Signatures. This Termination may be executed in
         counterparts, each of which shall be deemed a part of an original and
         all of which together shall constitute one agreement. Facsimile
         signatures shall be binding upon the parties hereto with the same
         force and effect as original signatures.

         IN WITNESS WHEREOF, Lessor and Lessee have executed and delivered this
instrument as of the date, month and year first above written.

JHS Leasing of Tampa, Inc. (Lessor)    Sykes Enterprises, Incorporated (Lessee)

By:                                    By:
   --------------------------------       -------------------------------------
        John H. Sykes                          W. Michael Kipphut
Title:  Director & President           Title:  Vice President and CFO

                                  Page 2 of 2

                                      21<PAGE>   1
                                                                    EXHIBIT 10.1
                                                                       EXECUTION

                              WOLVERINE TUBE, INC.
                          WOLVERINE TUBE (CANADA) INC.

                      FOURTH AMENDMENT TO CREDIT AGREEMENT

         This FOURTH AMENDMENT TO CREDIT AGREEMENT (this "AMENDMENT") is dated
as of May 31, 2000 and entered into by and among, WOLVERINE TUBE INC., a
Delaware corporation (the "COMPANY"), WOLVERINE TUBE (CANADA) INC., an Ontario
corporation ("WOLVERINE CANADA"; the Company and Wolverine Canada are each a
"BORROWER" and collectively, the "BORROWERS"), CREDIT SUISSE FIRST BOSTON, as
administrative agent (in such capacity, the "ADMINISTRATIVE AGENT"), MELLON
BANK, N.A., as documentation agent (in such capacity, the "DOCUMENTATION AGENT")
and the financial institutions listed on the signature pages hereto (each
individually referred to herein as a "LENDER" and collectively, as "LENDERS"),
and is made with reference to that certain Credit Agreement dated as of April
30, 1997, by and among the Borrowers, the Lenders, the Administrative Agent and
the Documentation Agent, as amended as of June 26, 1998, as of March 10, 1999
and as of June 30, 1999 (such Credit Agreement, as so amended, the "CREDIT
AGREEMENT"). Capitalized terms used herein without definition shall have the
same meanings herein as set forth in the Credit Agreement.

                                    RECITALS

         WHEREAS, the Borrowers have requested that Requisite Lenders, pursuant
to Section 10.6 of the Credit Agreement, agree to modify the provisions of the
Credit Agreement to permit Wolverine Canada to increase the amount of its
secured intercompany indebtedness to its 74.5%-owned Subsidiary, WRI, to
Cdn.$18.5 million, on the terms and conditions set forth herein.

         NOW, THEREFORE, in consideration of the premises and the agreements,
provisions and covenants herein contained, the parties hereto agree as follows:

                                    SECTION 1
                                   AMENDMENTS

         The terms of the Credit Agreement are hereby amended as follows:

A.       AMENDED DEFINITION. The following definition set forth in Subsection
1.1 of the Credit Agreement shall be amended by deleting each such definition in
its entirety and substituting the following definition therefor:

                  "WRI SECURITY AGREEMENT" means the general security agreement
                  executed by WRI in favor of Wolverine Canada to secure the
                  intercompany indebtedness in an aggregate principal amount not
                  in excess of Cdn.$18,500,000 owed by WRI to Wolverine Canada
                  and approved prior to its execution by the Administrative
                  Agent, with such amendments, supplements or other
                  modifications that are approved by Requisite Lenders from time
                  to time.
<PAGE>   2

B.       INTERCOMPANY INDEBTEDNESS. Subsection 7.1(iv) of the Credit Agreement
shall be amended by deleting the reference to "Cdn.$8,500,000" in the eighth
line thereof and substituting "Cdn.$18,500,000" therefor.

                                    SECTION 2
                    BORROWERS' REPRESENTATIONS AND WARRANTIES

         In order to induce Lenders to enter into this Amendment and to amend
the Credit Agreement in the manner provided herein, each of the Company and
Wolverine Canada hereby represents and warrants to each Lender that the
following statements are true, correct and complete:

         A.       CORPORATE POWER AND AUTHORITY. The Company and Wolverine
Canada have all requisite corporate power and authority to enter into this
Amendment and to carry out the transactions contemplated by, and perform their
obligations under, the Credit Agreement as amended by this Amendment (the
"Amended Agreement").

         B.       AUTHORIZATION OF AGREEMENTS. The execution and delivery of
this Amendment and the performance of the Amended Agreement have been duly
authorized by all necessary corporate action on the part of the Company and
Wolverine Canada, as the case may be.

         C.       NO CONFLICT. The execution and delivery by the Company and
Wolverine Canada of this Amendment and the performance by the Company and
Wolverine of the Amended Agreement do not and will not (i) violate any provision
of any law or any governmental rule or regulation applicable to the Company,
Wolverine Canada or any of their respective Subsidiaries, the Certificate or
Articles of Incorporation or Bylaws of the Company, Wolverine Canada or any of
their respective Subsidiaries or any order, judgment or decree of any court or
other agency of government binding on the Company, Wolverine Canada or any of
their respective Subsidiaries, (ii) conflict with, result in a breach of or
constitute (with due notice or lapse of time or both) a default under any
Contractual Obligation of the Company, Wolverine Canada or any of their
respective Subsidiaries, (iii) result in or require the creation or imposition
of any Lien upon any of the properties or assets of the Company, Wolverine
Canada or any of their respective Subsidiaries (other than Liens created under
any of the Loan Documents in favor of Agent on behalf of Lenders), or (iv)
require any approval of stockholders or any approval or consent of any Person
under any Contractual Obligation of the Company, Wolverine Canada or any of
their respective Subsidiaries.

         D.       GOVERNMENTAL CONSENTS. The execution and delivery by the
Company and Wolverine Canada of this Amendment and the performance by Company
and Wolverine Canada of the Amended Agreement do not and will not require any
registration with, consent or approval of, or notice to, or other action to,
with or by, any federal, state or other governmental authority or regulatory
body.

         E.       BINDING OBLIGATION. This Amendment and the Amended Agreement
have been duly executed and delivered by the Company and Wolverine Canada and
are the

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legally valid and binding obligations of the Company and Wolverine Canada
enforceable against the Company and Wolverine Canada in accordance with their
respective terms, except as may be limited by bankruptcy, insolvency,
reorganization, moratorium or similar laws relating to or limiting creditors'
rights generally or by equitable principles relating to enforceability.

         F.       INCORPORATION OF REPRESENTATIONS AND WARRANTIES FROM CREDIT
AGREEMENT. The representations and warranties contained in Section 5 of the
Credit Agreement are and will be true, correct and complete in all material
respects on and as of the Fourth Amendment Effective Date (as defined below) to
the same extent as though made on and as of that date, except to the extent such
representations and warranties specifically relate to an earlier date, in which
case they were true, correct and complete in all material respects on and as of
such earlier date.

         G.       ABSENCE OF DEFAULT. No event has occurred and is continuing or
will result from the consummation of the transactions contemplated by this
Amendment that would constitute an Event of Default or a Potential Event of
Default.

                                    SECTION 3
                                  MISCELLANEOUS

A.       REFERENCE TO AND EFFECT ON THE CREDIT AGREEMENT AND THE OTHER LOAN
DOCUMENTS.

         (i)      On and after the date hereof, each reference in the Credit
         Agreement to "this Agreement", "hereunder", "hereof", "herein" or words
         of like import referring to the Credit Agreement, and each reference in
         the other Loan Documents to the "Credit Agreement", "thereunder",
         "thereof" or words of like import referring to the Credit Agreement
         shall mean and be a reference to the provisions of the Credit Agreement
         as amended and waived hereby.

         (ii)     Except as specifically amended or waived by this Amendment,
         the Credit Agreement and the other Loan Documents shall remain in full
         force and effect and are hereby ratified and confirmed.

         (iii)    The execution, delivery and performance of this Amendment
         shall not, except as expressly provided herein, constitute a waiver of
         any provision of, or operate as a waiver of any right, power or remedy
         of the Administrative Agent or any Lender under, the Credit Agreement
         or any of the other Loan Documents.

B.       HEADINGS. Section and subsection headings in this Amendment are
included herein for convenience of reference only and shall not constitute a
part of this Amendment for any other purpose or be given any substantive effect.

C.       APPLICABLE LAW. THIS AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF THE
PARTIES HEREUNDER SHALL BE GOVERNED BY, AND SHALL BE CONSTRUED AND ENFORCED IN
ACCORDANCE WITH, THE INTERNAL LAWS OF THE STATE OF NEW YORK (INCLUDING WITHOUT

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LIMITATION SECTION 5-1401 OF THE GENERAL OBLIGATIONS LAW OF THE STATE OF NEW
YORK), WITHOUT REGARD TO CONFLICTS OF LAWS PRINCIPLES.

D.       COUNTERPARTS; EFFECTIVENESS. This Amendment may be executed in any
number of counterparts and by different parties hereto in separate counterparts,
each of which when so executed and delivered shall be deemed an original, but
all such counterparts together shall constitute but one and the same instrument;
signature pages may be detached from multiple separate counterparts and attached
to a single counterpart so that all signature pages are physically attached to
the same document. This Amendment shall become effective upon (i) the execution
of a counterpart hereof by Borrowers and Requisite Lenders, and (ii) receipt by
the Company and the Administrative Agent of written or telephonic notification
of such execution and authorization of delivery thereof.

                                    SECTION 4
                    ACKNOWLEDGEMENT AND CONSENT BY GUARANTORS

         Each of Tube Forming L.P., Small Tube Manufacturing Corp., and
Wolverine Finance Company hereby acknowledges that it has read this Amendment
and consents to the terms hereof and further hereby confirms and agrees that,
notwithstanding the effectiveness of this Amendment, the obligations of such
Loan Party under each of the Loan Documents to which it is a party shall not be
impaired and each of the Loan Documents to which it is a party are, and shall
continue to be, in full force and effect and are hereby confirmed and ratified
in all respects.

                  [Remainder of page intentionally left blank]

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<PAGE>   5
                                                                       EXECUTION

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed and delivered by their respective officers thereunto duly
authorized as of the date first written above.

                                    WOLVERINE TUBE, INC.

                                    By:  /s/ James E. Deason
                                        ---------------------------------------
                                        Name: James E. Deason
                                        Title: Ex. V.P. Chief Financial Officer

                                    Notice Address:

                                    Wolverine Tube, Inc.
                                    1525 Perimeter Parkway, Suite 210
                                    Huntsville, AL 35808
                                    Attention:  James E. Deason

<PAGE>   6

                                    WOLVERINE TUBE(CANADA) INC.

                                    By:  /s/ James E. Deason
                                        ---------------------------------------
                                        Name:
                                        Title:

                                    Notice Address:

                                    Wolverine Tube, Inc.
                                    1525 Perimeter Parkway, Suite 210
                                    Huntsville, AL 35808
                                    Attention:  James E. Deason

<PAGE>   7

                           TUBE FORMING L.P.,
                           a Delaware limited partnership

                           By:      WOLVERINE TUBE, INC.

                                    By:  /s/ James E. Deason
                                        ----------------------------------------
                                        Name:
                                        Title:

                                    Notice Address:

                                    Wolverine Tube, Inc.
                                    1525 Perimeter Parkway, Suite 210
                                    Huntsville, AL 35808
                                    Attention:  James E. Deason

<PAGE>   8

                                    SMALL TUBE MANUFACTURING CORP.,
                                    A DELAWARE CORPORATION

                                    By:  /s/ James E. Deason
                                        ----------------------------------------
                                        Name:
                                        Title:

                                    Notice Address:

                                    Wolverine Tube, Inc.
                                    1525 Perimeter Parkway, Suite 210
                                    Huntsville, AL 35808
                                    Attention:  James E. Deason

<PAGE>   9

                                    WOLVERINE FINANCE COMPANY,
                                    a Tennessee corporation

                                    By:  /s/ James E. Deason
                                        ----------------------------------------
                                        Name:
                                        Title:

                                    Notice Address:

                                    Wolverine Tube, Inc.
                                    1525 Perimeter Parkway, Suite 210
                                    Huntsville, AL 35808
                                    Attention:  James E. Deason

<PAGE>   10

                                    CREDIT SUISSE FIRST BOSTON,
                                    as the Administrative Agent and Lender

                                    By:  /s/ Robert N. Finney
                                        ---------------------------------------
                                        Name: Robert N. Finney
                                        Title: Managing Director

                                    By:  /s/ Thomas G. Muoio
                                        ---------------------------------------
                                        Name: Thomas G. Muoio
                                        Title: Vice President

                                    Notice Address:

                                    Credit Suisse First Boston
                                    11 Madison Avenue
                                    New York, NY  10010-3629
                                    Attention:  Robert Finney

<PAGE>   11

                                    MELLON BANK, N.A., individually and as
                                    Documentation Agent

                                    By:  /s/ Christopher S. Helmeci
                                        ---------------------------------------
                                        Name: Christopher S. Helmeci
                                        Title: Vice President

                                    Notice Address:

                                    Mellon Bank, N.A.
                                    Three Mellon Bank Center
                                    23rd Floor
                                    Pittsburgh, PA  15259-0003
                                    Attention:  Loan Administration

                                    Copy to:

                                    Mellon Bank, N.A.
                                    One Mellon Bank Center
                                    Pittsburgh, PA 15258-0001
                                    Attention:  Roger N. Stanier

<PAGE>   12

                                    CREDIT LYONNAIS NEW YORK BRANCH
                                    as a Lender

                                    By:  /s/ Robert Ivosevich
                                        ---------------------------------------
                                        Name: Robert Ivosevich
                                        Title: Senior Vice President

                                    Notice Address:

                                    Credit Lyonnais New York Branch
                                    2200 Ross Avenue
                                    Suite 4400W
                                    Dallas, TX  75201
                                    Attention:  Brian Brown

<PAGE>   13

                                    BANK OF AMERICA, N.A.
                                    f/k/a Bank of America National Trust and
                                    Savings Association, (successor by merger to
                                    Bank of America Illinois), successor by
                                    merger to Bank of America, N.A., f/k/a
                                    NationsBank, N.A., (successor by merger to
                                    NationsBank, N.A. (South))

                                    By:  /s/ Bianca Hemmen
                                        ---------------------------------------
                                        Name: Bianca Hemmen
                                        Title: Managing Director

                                    Notice Address:

                                    Bank of America
                                    901 Main Street, 67th Floor
                                    Dallas, TX  75202
                                    Attention:  Bianca Hemmen

<PAGE>   14

                                    THE BANK OF NOVA SCOTIA,
                                    as a Lender

                                    By:  /s/ William E. Zarrett
                                        ---------------------------------------
                                        Name: William E. Zarrett
                                        Title: Managing Director

                                    Notice Address:

                                    The Bank of Nova Scotia
                                    Suite 2700
                                    600 Peachtree Street NE
                                    Atlanta, GA  30308
                                    Attention:  Pat Brown

<PAGE>   15

                                    FIRST UNION NATIONAL BANK
                                    as a Lender

                                    By:  /s/ William B. Quantz
                                        ---------------------------------------
                                        Name: William B. Quantz
                                        Title: Vice President

                                    Notice Address:

                                    First Union Securities, Inc.
                                    201 South College Street, 24(th) Floor
                                    Charlotte, NC  28288-1183
                                    Attention:  Lisa White

<PAGE>   16

                                    SUNTRUST BANK (successor in interest to
                                    SunTrust Bank, Nashville, N.A.)
                                    as a Lender

                                    By:  /s/ Jon C. Long
                                        ---------------------------------------
                                        Name: Jon C. Long
                                        Title: Vice President

                                    Notice Address:

                                    Suntrust Bank
                                    P.O.Box 305110
                                    Nashville, TN  37230-5110
                                    Attention:  Jon C. Long

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