Answer:
czechoslovakia
Explanation:
The Warsaw Pact or Treaty of Warsaw was a military alliance formed on May 14, 1955 by the socialist countries of Eastern Europe and the Soviet Union, which also became known as the Eastern bloc. The corresponding treaty was signed in the Polish capital Warsaw and established the alignment of member countries with Moscow, establishing a commitment to mutual assistance in the event of military aggression and legalizing in practice the presence of millions of Soviet military personnel in Eastern European countries since 1945.
Warsaw Pact forces were used against some of its members, such as in 1968 during the Prague Spring when they invaded Czechoslovakia to end the flexibilization of the reform that was facing the government, judged by the USSR, as tending to destroy the Czech socialism. The so-called Brezhnev Doctrine, which marked Soviet Union's military foreign policy at the time, stated: "When forces that are hostile to socialism try to change the development of some socialist country into capitalism, they become not only a problem of the country in but a common problem affecting all socialist countries. "Albania withdrew from the alliance in 1961 as a result of the separation of its pro-Chinese-Soviet-Stalinist hardliners, backed by the PRC (North Korea).
