The document describes key events of the Korean War and its role in escalating tensions of the Cold War. After World War 2, Korea was divided into North and South, each with separate governments backed by the USSR and USA respectively. In June 1950, North Korea invaded South Korea in an attempt to reunify the country under Communist rule. The United Nations (led by the USA) sent troops to South Korea to stop the invasion and prevent further spread of Communism. Fighting continued for three years until an armistice in 1953 divided Korea along the original border at the 38th Parallel, though a peace treaty was never signed. The Korean War exacerbated tensions between the USA and USSR and demonstrated the US's willingness to intervene militarily