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
Dissolution of the Soviet Union to exist. Both the Revolutions of 1989 and the dissolution of the USSR also marked the end of the Cold War. Several of the former Soviet republics have retained close links with the Russian Federation and formed multilateral organizations such as the Commonwealth of Independent States, Eurasian Economic Community, the Union State, the Eurasian Customs Union and the Eurasian Economic Union to enhance economic and security cooperation. On the other hand, the Baltic states have joined NATO and the European Union. Mikhail Gorbachev was elected General Secretary by the Politburo on March 11, 1985, three hours after predecessor Konstantin Chernenko's