When it was clear that the Soviet Union would no longer use force to control the Warsaw Pact countries a series of rapid changes started in Eastern Europe in 1989. The new government in Eastern Europe were much less supportive to the Warsaw Pact, and in January 1991 Czechoslovakia, Hungary, and Poland announced that they would withdraw all support by July 1st that year. Bulgaria followed suit in February, and it was clear that the pact was effectively dead. The Soviet Union acknowledged this, and the pact was officially dissolved at a meeting in Prague on July the 1, 1991. .
Cold War, Eastern Block & NATO.
The cold war (September 2, 1945 - December 26, 1991) was the conflict between the USA and its NATO allies - loosely described as the West - and the former Soviet Union and its Warsaw Pact allies - loosely described as the Eastern Block. A full scale "east versus west" war never actually broke out, hence the metaphor of a "cold" war, rather than a "hot" shooting war. Instead, the conflict continued from the end of World War II until the break up of the Soviet Union in the early 1990s. The aggression between those two parts of the world never shaped in an armed conflict, but was conducted by or against surrogates and through spies and traitors, which were working undercover. In each of those conflicts, at least one of the major powers operated mainly by arming or funding surrogates. Because of that, the population of the major powers were rarely directly impacted by this war. .
One major hotspots o conflict was Germany, particularly Berlin. Arguably, the most vivid symbol of the Cold War was the Berlin Wall, isolating West Berlin (the portion controlled by West Germany and allied with France, England and the United States) from East Germany, which completely surrounded it. Many East Germans risked death attempting to cross the defences surrounding the wall to reach freedom in West Berlin, and many were killed in the attempt.