After the United States has withdrawn from Vietnam, the Soviet Union took its place. The Soviet Union supported Vietnam after the Second Indochina War too. The Sino-Vietnamese relations have deteriorated, moreover, the Chinese People's Liberation Army attacked Vietnam in 1979!
The Sino-Vietnamese conflicts of 1979–1991 were a series of border and naval clashes between the People's Republic of China and the Socialist Republic of Vietnam following the Sino-Vietnamese War in 1979.
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