

The invasion began three days after the United States atomic bombing of Hiroshima, and included plans to invade South Sakhalin. On 9 August the USSR launched a full-scale invasion of Manchuria, beginning the Soviet–Japanese War. On 5 April, the Soviet Union formally repudiated the Soviet–Japanese Neutrality Pact. The United States would aid the Red Army in Project Hula, in preparation for the invasion. As a result of their participation, the Soviets would be awarded South Sakhalin and the Kuril Islands, among other concessions. It was known in Japan as Karafuto Prefecture and the Northern District.ĭuring the Yalta Conference of 1945, Soviet leader Joseph Stalin pledged to enter the fight against the Empire of Japan "in two or three months after Germany has surrendered and the war in Europe is terminated." This would create another strategic front against Japan, deemed necessary to end the war.
In the Treaty of Portsmouth in 1905, control of the island was split, with the Russian Empire controlling the northern half and the Japanese controlling the portion south of the 50th parallel north.

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