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
Communist Party of the Soviet Union and effective control of the party organization remained in Gorbachev's control. Chernenko died on 10 March 1985 and was succeeded in office by Gorbachev on 11 March 1985. Gorbachev was elected CPSU General Secretary on 11 March 1985, one day after Chernenko's death. When he acceded, the Soviet Union was stagnating but was stable and may have continued largely unchanged into the 21st century if not for Gorbachev's reforms. Gorbachev conducted a significant personnel reshuffling of the CPSU leadership, forcing old party conservatives out of office. In 1985 and early 1986, the new party leadership called for "uskoreniye" (). Gorbachev