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 from the area around Chernobyl. Taubman noted that the disaster marked "a turning point for Gorbachev and the Soviet regime". Gorbachev later described the incident as one which made him appreciate the scale of incompetence and cover-ups in the Soviet Union. From April to the end of the year, Gorbachev became increasingly open in his criticism of the Soviet system, including food production, state bureaucracy, the military draft, and the large size of the prison population. Gorbachev's primary goal as general secretary was to revive the Soviet economy after the stagnant Brezhnev years. In 1985, he announced that the economy