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The Sino-Soviet Treaty of August 14, 1945, was an agreement between the Republic of China and the Soviet Union. In this treaty, the Soviet Union agreed not to support the Chinese Communists in the ongoing Chinese Civil War. In return, the Soviet Union gained partnership in the Chinese Eastern Railway for a period of 30 years. This railway was constructed in Manchuria by Russia in the late 19th century as an extension of the Trans-Siberian Railroad. The Soviet Union later returned its share of the railway to the People's Republic of China in 1953.1

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