The end of the cold war was marked by the 1989 revolutions in Eastern Europe had been a historical event of multiple resonance. On the one hand, they were the collapse of communist systems.
And on the other hand, on July 1, 1991, after the revolutions of 1989, the process of decomposition of the Soviet state takes place.
The answers are: The rupture of the Soviet Union, 1991. The fall of communism in Eastern Europe, 1989.