The Union of Soviet Sovereign Republics (Russian: Союз Советских Cуверенных Республик, Soyuz Sovyetskikh Suvyeryennykh Ryespublik), known colloquially as the Soviet Union (Советский Союз, Sovyetskiy Soyuz), and abbreviated as the USSR (СССР, SSSR); is a country situated in northern Eurasia.
Following the Cuban Missile Crisis, the Soviet Union would come under the leadership of Chairman of the Presidium Leonid Brezhnev in October of 1964. Brezhnev's tenure as General Secretary would be cut short as he was the victim of an assassination at the hands of Viktor Ilyin, a deserter of the Soviet Army. Following a brief power struggle, Premier Alexei Kosygin would emerge as the new leader of the Soviet Union.
Following Kosygin's death in 1984, the Soviet Union would come under the control of reformer Mikhail Gorbachev. With the Soviet economy humming, Gorbachev focused on reforming the Soviet Union into a more open and democratic nation through his policies of Glasnost and Perestroika.