Japan and the Soviet Union clashed repeatedly late in the 1930s most notably in 1938 near the Soviet port of Vladivostok, and then again in a massive battle in 1939 on the Soviet controlled Mongolian border at Khalkin Gol - Nomonhan. At Khalkin Gol the Red Army decisively defeated Japan, ultimately causing the Japanese to abandon plans for invading Siberia with up to 45 infantry divisions.
