外東北
After the atomic bombing of Hiroshima, Japan in 1945, the Soviet Union invaded from Soviet Outer Manchuria as part of its declaration of war against Japan. Soon afterwards, the Chinese Communist Party and Chinese Nationalist Party (Kuomintang) started fighting for control over Manchuria. The communists won in the Liaoshen Campaign and took complete control over Manchuria. With the encouragement of the Soviet Union, Manchuria was then used as a staging ground during the Chinese Civil War for the Chinese Communist Party, which emerged victorious in 1949. Ambiguities in the treaties that ceded Outer Manchuria to Russia led to dispute over the political status of several islands. The Kuomintang government in Taiwan (Formosa) complained to the United Nations, which passed resolution 505 on February 1, 1952, denouncing Soviet actions over the violations of the 1945 Sino-Soviet Treaty of Friendship and Alliance.