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The introduction of Glasnost made changes in economic practice, internal affairs and international relations better.
(http://www.history.com/topics/cold-war/perestroika-and-glasnost) -
"Within five years, Gorbachev’s revolutionary program swept communist governments throughout Eastern Europe from power and brought an end to the Cold War (1945-91), the largely political and economic rivalry between the Soviets and the United States and their respective allies that came out following World War II."
(http://www.history.com/topics/cold-war/perestroika-and-glasnost ) -
This is a time span over the events in Russia and Europe.
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It required destruction of the Parties' ground-launched ballistic and cruise missiles with ranges of between 500 and 5,500 kilometers, their launchers and associated support structures and support equipment within three years after the Treaty enters into force.
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The Berlin Wall stood until November 9, 1989, when the top of the East German Communist Party announced that citizens of the GDR could cross the border whenever they pleased.
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"In the late 1980s, the democratic organizations began to re-emerge in Hungary. He first made contact with the Independent Smallholders’ Party, the leading noncommunist party of the postwar period."
http://www.britannica.com/biography/Jozsef-Antall
