Korean reunification selected the 38th parallel as a dividing line. Japanese troops to the North of this line were to surrender to the Soviet Union and troops to the South of this line would surrender to the United States. This was not originally intended to result in a long-lasting partition, but Cold War politics resulted in the establishment of two separate governments in the two zones in 1948 and rising tensions prevented cooperation. The desire of many Koreans for a peaceful unification was dashed when the Korean War broke out in 1950. In June 1950, troops from North Korea invaded South Korea.
Soviet Union in the Korean War certainly influenced by the Korean War shaped relations between the two countries until 1989. Soviet Union in the Korean War Though not officially belligerent during the Korean War (1950–1953), the Soviet Union played a significant, covert role in the conflict. It provided material and medical services, as well as Soviet pilots and aircraft, most notably MiG 15 fighter jets, to aid the North Korean-Chinese forces against the United Nations Forces. The Soviet 25th Army took part in the Soviet advance into northern Korea immediately after World War II had ended, and was headquartered at Pyongyang for a period. Like the