In 1961, with his successor Liu Shaoqui, Mao declared that the Soviet Leadership was a "Revisionist Traitor Group", beginning a sense of hostility between the Soviet Union and China. In 1962, to Soviet Premier Vyacheslav Molotov's distate, China declared war on India. The Soviet Union sent arms shipments to India to stop the Chinese, but China won.
In 1969, the Sino-Soviet War started after a few warning shots on Zhenbao Island. The Soviet Union invaded, and destroyed massive parts of Manchurai and Uigurstan. Mao was killed during the siege of Beijing, as was Liu. China surrendered afterwards, and was annexed by the Soviet Union.