Relations between the Soviet Union and Japan between the Communist takeover in 1917 and the collapse of Communism in 1991 tended to be hostile. Japan had sent troops to counter the Bolshevik presence in Russia's Far East during the Russian Civil War.

During WW2, relations between Japan and the Soviet Union were typically hostile.

Japan and the Soviet Union signed a neutrality pact in 1941. This lasted until April 1945, when Stalin broke this pact as part of the Yalta agreement and Soviet troops invaded Manchuria in Aug 1945.
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