High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! The Soviet?Japanese Border Wars were a series of border conflicts between the Soviet Union and Japan between 1938 and 1939. After the occupation of Manchukuo and Korea, Japan turned its military interests to Soviet territories. Conflicts between the Japanese and the Soviets frequently happened on the border of Manchuria. The Battle of Khalkhin Gol, sometimes spelled Halhin Gol or Khalkin Gol after the Halha River passing through the battlefield and known in Japan as the Nomonhan Incident (after a nearby village on the border between Mongolia and Manchuria), was the decisive engagement of the undeclared Soviet?Japanese Border War (1939), or Japanese?Soviet War. It should not be confused with the conflict in 1945 when the USSR declared war in support of the other Allies of World War II and launched Operation August Storm.