️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ Normal relations continued until 1948, when the communists seized power and relations froze rapidly. The Soviet Invasion<unk>
of Czechoslovakia in August 1968 further complicated U.S.-Czechoslovak relations. The United States referred the matter to the United Nations Security Council as a violation of the United Nations Charter, but no action was taken against the Soviets.<unk> The United States referred the matter to the United Nations Security Council as a violation of the United Nations Charter, but no action was taken against the Soviets.