At that time, Cold War was marking its first war, that is, the Korean War (1950-1953) which came out as a major proxy war between the United States and its allies versus the Soviet Union and its allies. Old alliances were strengthened and formed new ones including SEATO. The war showed the readiness of both superpowers to fight upon other people’s ground for the advancement of their respective ideological causes. It brought out the very element of danger of nuclear escalation where even now both sides had nuclear arms. The Korean War gave rise to the “limited war” doctrine, wherein not every war required all-out mobilization. This type of doctrine would be seen in subsequent Cold War conflicts, in particular, the Vietnam War. The war had some universal impacts, one of which showed that Soviet power had its limits and that the nation was determined to contain communism. It also heightened the tensions between the United States and China, with far-reaching effects in subsequent decades.