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 with the United States and other Western European powers and unaddressed inefficiencies in the economy, led to stagnant economic growth under Alexei Kosygin, and further with Leonid Brezhnev and a growing disillusionment. After a younger vigorous Mikhail Gorbachev (b.1931), assumed leadership in 1985, (following two short-term elderly leaders who quickly died in succession), rapid steps were taken to transform the tottering Soviet economic system in the direction of a market economy once again. Gorbachev and his allies envisioned the introduction of an economy similar to Lenin's earlier New Economic Policy through a program of "perestroika", or restructuring, but their reforms