Cold War (1985–1991) reduced some strategic arms unilaterally. Fundamental to the dissolution of the Soviet Union, the Gorbachev policy initiatives of Restructuring ("Perestroika") and Openness ("Glasnost") had ripple effects throughout the Soviet world, including eventually making it impossible to reassert central control over Warsaw Pact member states without resorting to military force. On June 12, 1987, Reagan challenged Gorbachev to go further with his reforms and democratization by tearing down the Berlin Wall. In a speech at the Brandenburg Gate next to the wall, Reagan stated: While the aging communist European leaders kept their states in the grip of "normalization", Gorbachev's reformist policies
Mikhail Gorbachev in the Soviet Union weakened, and centralized power from Moscow was unable to combat centrifugal forces in the South. In the elections, many Party candidates were defeated. Furthermore, Boris Yeltsin was elected as mayor of Moscow and returned to political prominence to become an increasingly vocal critic of Gorbachev. Gorbachev chose a vice president; but when first Shevardnadze, then Kazakh leader Nursultan Nazarbayev, turned it down, Gorbachev chose Gennady Yanayev, the head of the All-Union Central Council of Trade Unions and a known hardliner. This decision would come back to haunt Gorbachev later. In contrast to the controversy at home