The Korean War (25 June 1950 - armistice signed 27 July 1953) was a military conflict between the Republic of Korea, supported by the United Nations, and North Korea, supported by the People's Republic of China (PRC), with military material aid from the Soviet Union. The war was a result of the physical division of Korea by an agreement of the victorious Allies at the conclusion of the Pacific War at the end of World War II. The Korean peninsula was ruled by Japan from 1910 until the end of World War II. Following the surrender of Japan in 1945, American administrators divided the peninsula along the 38th Parallel, with United States troops occupying the southern part and Soviet troops occupying the northern part. The failure to hold free elections throughout the Korean Peninsula in 1948 deepened the division between the two sides, and the North established a Communist government. The situation escalated into open warfare when North Korean forces invaded South Korea on 25 June 1950. It