Gorbachev's best statement about perestroika is that without a perestroika, the cold war would simply not be complete. But the world could not continues to evolve, as it was, with a sharp threat of a nuclear war.
In order to reform the relaxed Soviet Union, the democratization of the Communist Party was promoted through the policy of Mikhail Gorbachev's party "perestroika" and "glasnost". Perestroika refers to the reconstruction of the political and economic system founded by the Communist Party.
Prestroika means reformation, and volume means openness. The openness is primarily reflected in relations with the West, which gave a major contribution to the end of the Cold War.