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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, and both countries had been in opposite camps during World War II and the Cold War. In addition, territorial conflicts over the Kuril Islands and South Sakhalin were a constant source of tension. These, with a number of smaller conflicts, prevented both countries from signing a peace treaty after World War II, and even today matters remain unresolved. Strains in Japan–Soviet Union relations have deep historical roots, going back to the competition of the Japanese and Russian empires for dominance in Northeast Asia. The Soviet government refused to sign the 1951 peace treaty and the state of war between the Soviet Union and Japan technically existed until 1956, when it was ended by the Soviet–Japanese Joint Declaration of 1956. A formal peace treaty between the Soviet Union (subsequently Russia) and Japan still has not been signed. The main stumbling block to improving relations between the Soviet Union and Japan in the post-war period has been the territorial dispute over the Kurils, which are known as the ''Northern Territories'' in Japan. ==Russian Civil War and recognition (1917-1925)== (詳細はimperial Russia, the predecessor state of the Soviet Union, in the Russo-Japanese War of 1904-05. During the Russian Civil War (1918–21), Japan (as a member of the Allied interventionist forces) occupied Vladivostok from 1918 until 1922, using as many as 70,000 troops. Japan formally recognized the Soviet Union in January 1925 with the Soviet–Japanese Basic Convention. They agreed that the 1905 Treaty of Portsmouth (the treaty between the Russian Empire and Imperial Japan which ended the Russo-Japanese War) remained in force, while other agreements and treaties between the two countries should be re-examined. By concluding this agreement, Japan formally recognized the Soviet Union. Ratifications were exchanged in Beijing on February 26, 1925. The agreement was registered in ''League of Nations Treaty Series'' on May 20, 1925.〔''League of Nations Treaty Series'', vol. 34, pp. 32-53.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Japan–Soviet Union relations」の詳細全文を読む スポンサード リンク
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