Question: Who was an adivisor to the eighth leader of the Soviet Union who died in 2006? 

Context articles: Leonid Brezhnev
First Chief Directorate
Mikhail Gorbachev
Soviet deportations from Lithuania
Eighth Five-Year Plan (Soviet Union)
Karl Selter
Vadim Zagladin
Dissolution of the Soviet Union
List of leaders of the Soviet Union
The Barricades

Leonid Ilyich Brezhnev ( ; (19 December 1906-10 November 1982) was a Soviet politician who led the Soviet Union from 1964 to 1982 as the General Secretary of the Central Committee (CC) of the Communist Party of the Soviet Union (CPSU) until his death and funeral in 1982.
 His eighteen-year term as General Secretary was second only to that of Joseph Stalin in duration.
 During Brezhnev's rule, the global influence of the Soviet Union grew dramatically, in part because of the expansion of the Soviet military during this time.
 His tenure as leader was marked by the beginning of an era of economic and social stagnation in the Soviet Union.
The First Main Directorate (or First Chief Directorate, Russian: Первое главное управление, "Pervoye glavnoye upravleniye") of the Committee for State Security of the USSR (PGU KGB) was the organization responsible for foreign operations and intelligence activities by providing for the training and management of covert agents, intelligence collection administration, and the acquisition of foreign and domestic political, scientific and technical intelligence in the Soviet Union.
 The First Chief Directorate was formed within the KGB directorate in 1954, and after the collapse of the Soviet Union was renamed as the Central Intelligence Service and finally the Foreign Intelligence Service (SVR RF).
 Although the agency "SVR" restyle in 1991 implies a generic overseas surveillance activity, the primary foreign intelligence service in Russia and the Soviet Union has been the GRU, a military intelligence organization and special operations force shrouded in secrecy, most famed for stealing the blueprints of the atomic bomb during the Manhattan Project and barring entry into its headquarters to anyone, even the leader of the Soviet Union proper, without a formal authentication.
Mikhail Sergeyevich Gorbachev, ( ; Russian: Михаи́л Серге́евич Горбачёв ; ] ; born 2 March 1931) is a former Soviet statesman.
 He was the eighth and last leader of the Soviet Union, having been General Secretary of the Communist Party of the Soviet Union from 1985 until 1991.
 He was the country's head of state from 1988 until 1991 (titled as Chairman of the Presidium of the Supreme Soviet from 1988 to 1989, as Chairman of the from 1989 to 1990, and as Soviet Union]] from 1990 to 1991).
Soviet deportations from Lithuania were a series of 35 mass deportations carried out in Lithuania, a country that was occupied as a constituent socialist republic of the Soviet Union, in 1941 and 1945–1952.
 At least 130,000 people, 70% of them women and children, were forcibly transported to labor camps and other forced settlements in remote parts of the Soviet Union, particularly in the Irkutsk Oblast and Krasnoyarsk Krai.
 Among the deportees were about 4,500 Poles.
 These deportations do not include Lithuanian partisans or political prisoners (approximately 150,000 people) deported to Gulags (prison camps).
 Deportations of the civilians served a double purpose: repressing resistance to Sovietization policies in Lithuania and providing free labor in sparsely inhabited areas of the Soviet Union.
 Approximately 28,000 of Lithuanian deportees died in exile due to poor living conditions.
 After Stalin's death in 1953, the deportees were slowly and gradually released.
 The last deportees were released only in 1963.
 Some 60,000 managed to return to Lithuania, while 30,000 were prohibited from settling back in their homeland.
 Similar deportations took place in Latvia, Estonia, and other parts of the Soviet Union (see Soviet deportations from Estonia and population transfer in the Soviet Union).
 Lithuania observes the annual Mourning and Hope Day on June 14 in memory of those deported.
The Eighth Five-Year Plan of the Union of Soviet Socialist Republics (USSR) was a set of production goals and guidelines for administering the economy from 1966 to 1970—part of a series of such plans used by the USSR from 1928 until its dissolution.
 "Directives" for the plan involved set high goals for industrial production, especially in vehicles and appliances.
 These directives for the Eighth Five-Year Plan was approved by the Central Committee of the Communist Party of the Soviet Union and by the 23rd Congress of the Communist Party of the Soviet Union but no final version was apparently ever ratified by the Supreme Soviet of the Soviet Union.
 Nevertheless, some of the changes envisioned were made.
Karl Selter (born June 24, 1898 in Koeru, Estonia – died January 31, 1958 in Geneva, Switzerland) was an Estonian politician and a Minister of Foreign Affairs of Estonia.
 He served as Minister of Economic Affairs from 1933 to 1938 and as minister of Foreign affairs from 1938 to 1939.
 His historically most memorable act was to sign a non-aggression and mutual assistance treaty with the Soviet leaders in Moscow in September 1939.
 This was also his personal and national Estonian most tragic act.
 It followed a brutal ultimatum from the Soviet Foreign Minister, Vyacheslav Molotov on September 24.
 Molotov said to Setler: Estonia gained sovereignty when the Soviet Union was powerless, but you “don’t think that this can last… forever… The Soviet Union is now a great power whose interests need to be taken into consideration.
 I tell you—the Soviet Union needs enlargement of her security guarantee system; for this purpose she needs an exit to the Baltic Sea … I ask you, do not compel us to use force against Estonia.”
 The enforced in this manner treaty gave the Soviet army a right to set up military bases in Estonia, and it significantly reduced Estonia's independence until Estonia was formally incorporated into the Soviet Union between June and August 1940.
 Selter left Estonia in November 1939, resigning both as Foreign Minister and as a member of Parliament.
 He moved to Geneva, Switzerland as a diplomat.
 After Germany occupied Estonia between 1941 and 1944, and after it was re-incorporated into the Soviet Union in 1944, he stayed in Switzerland as an exiled diplomat and politician.
Vadim Valentinovich Zagladin (June 23, 1927 - November 17, 2006), Soviet politician and ideologist, was one of the leading theoreticians of Perestroika.
 Collaborator and adviser to Leonid Brezhnev and Mikhail Gorbachev, he was one of the Soviet politicians closest to Western Europe.
 Personal friend of François Mitterrand, Willy Brandt and Giorgio Napolitano, Zagladin was the theorist of a reformed communism, very close to European social democracy.
The Soviet Union was dissolved on December 26, 1991.
 It was a result of the declaration number 142-Н of the Soviet of the Republics of the Supreme Soviet of the Soviet Union.
 The declaration acknowledged the independence of the former Soviet republics and created the Commonwealth of Independent States (CIS), although five of the signatories ratified it much later or did not do so at all.
 On the previous day, Soviet President Mikhail Gorbachev, the eighth and final leader of the Soviet Union, resigned, declared his office extinct, and handed over its powers – including control of the Soviet nuclear missile launching codes – to Russian President Boris Yeltsin.
 That evening at 7:32, the Soviet flag was lowered from the Kremlin for the last time and replaced with the pre-revolutionary Russian flag.
Under the 1977 Constitution of the Union of Soviet Socialist Republics (USSR), the Chairman of the Council of Ministers was the head of government and the Chairman of the Presidium of the Supreme Soviet was the head of state.
 The office of the Chairman of the Council of Ministers was comparable to a prime minister in the First World, whereas the office of the Chairman of the Presidium was comparable to a president in the First World.
 In the Soviet Union's seventy-year history there was no official "leader of the Soviet Union" office, but during most of that era there was a "de facto" top leader who usually led the country through the office of the Premier or the office of the General Secretary of the Communist Party of the Soviet Union (CPSU).
 In the ideology of Vladimir Lenin the head of the Soviet state was a collegiate body of the vanguard party (see "What Is to Be Done?
").
The Barricades (Latvian: "Barikādes" ) were a series of confrontations between Latvia and forces loyal to the Soviet Union in January 1991 which took place mainly in Riga.
 The events are named for the popular effort of building and protecting barricades from 13 January until about 27 January.
 Latvia, which had declared restoration of independence from the Soviet Union a year earlier, anticipated that Soviet Union might attempt to regain control over the country by force.
 After attacks by the Soviet OMON on Riga in early January, the government called on people to build barricades for protection of possible targets (mainly in the capital city of Riga and nearby Ulbroka, as well as Kuldīga and Liepāja).
 Six people were killed in further attacks, several were wounded in shootings or beaten by OMON.
 Most victims were shot during the Soviet attack on the Latvian Ministry of the Interior on January 20.
 One other person died in a building accident reinforcing the barricades.
 Casualties among Soviet loyalists are considered likely, but the exact number remains unknown.
 A total of 15,611 people have registered as having been participants of the Barricades.