History of the Soviet Union (1927 -1953) has zero connections to the Warsaw Pact.
 This period is also known as the Era of Stagnation, a period of adverse economic, political, and social effects in the country, which began during the rule of Brezhnev and continued under his successors Yuri Andropov and Konstantin Chernenko
 In the mid-1980s, the last Soviet leader, Mikhail Gorbachev, sought to reform the country through his policies of glasnost and perestroika

