Asked in History, Politics & Society , Cold War In June 1950, the first military action of the Cold War began when the Soviet-backed North Korean People’s Army invaded its pro-Western neighbor … countervailed by taking the part in the war with United Nations Forces which was composed the United States, United Kingdom, France, Netherlands, Belgium, Canada, Turkey, Ethiopia, Thai, Philippine, Columbia, Greece, Australia, New Zealand, South Africa, Luxembourg and South Korea. Korean War On The Cold War 992 Words | 4 Pages. Cold War, the open yet restricted rivalry that developed after World War II between the United States and the Soviet Union and their respective allies. The Red Scare was hysteria over the perceived threat posed by Communists in the U.S. during the Cold War between the Soviet Union and the United States, which The Cold War in Korea. CBS News Aug. 15, 1945 The first true test of the Cold War erupted in 1950, and for six months combat raged up and down the Korean peninsula before settling into years of trench warfare. The Korean war was caused by communist North Korea invading democratic South Korea, so it's the spread of Communism. Their distaste for each other resulted in several conflicts that are now called the Cold War. No, the Korean war was not technically part of the cold war but it was a front for the Americans and the Russians to compete in. The end of World War Two left many international relations feelings strained and bitter; these negative feelings were especially evident between the United States and the Soviets. The Cold War was waged on political, economic, and propaganda fronts and had only limited recourse to weapons. The U.S intervened and fought communist Chinese (and Soviet) troops to end the war.