<P> Another major consideration was the possible Soviet reaction in the event that the U.S. intervened . The Truman administration was fearful that a war in Korea was a diversionary assault that would escalate to a general war in Europe once the United States committed in Korea . At the same time, "(t) here was no suggestion from anyone that the United Nations or the United States could back away from (the conflict)". Yugoslavia--a possible Soviet target because of the Tito - Stalin Split--was vital to the defense of Italy and Greece, and the country was first on the list of the National Security Council's post-North Korea invasion list of "chief danger spots". Truman believed if aggression went unchecked, a chain reaction would be initiated that would marginalize the United Nations and encourage Communist aggression elsewhere . The UN Security Council approved the use of force to help the South Koreans and the U.S. immediately began using what air and naval forces that were in the area to that end . The Truman administration still refrained from committing on the ground because some advisers believed the North Koreans could be stopped by air and naval power alone . </P> <P> The Truman administration was still uncertain if the attack was a ploy by the Soviet Union or just a test of U.S. resolve . The decision to commit ground troops became viable when a communiqué was received on 27 June indicating the Soviet Union would not move against U.S. forces in Korea . The Truman administration now believed it could intervene in Korea without undermining its commitments elsewhere . </P> <P> On 25 June 1950, the United Nations Security Council unanimously condemned the North Korean invasion of the Republic of Korea, with UN Security Council Resolution 82 . The Soviet Union, a veto - wielding power, had boycotted the Council meetings since January 1950, protesting that the Taiwanese "Republic of China" and not the mainland "People's Republic of China" held a permanent seat in the UN Security Council . After debating the matter, the Security Council, on 27 June 1950, published Resolution 83 recommending member states provide military assistance to the Republic of Korea . On 27 June President Truman ordered U.S. air and sea forces to help the South Korean regime . On 4 July the Soviet Deputy Foreign Minister accused the United States of starting armed intervention on behalf of South Korea . </P> <P> The Soviet Union challenged the legitimacy of the war for several reasons . The ROK Army intelligence upon which Resolution 83 was based came from U.S. Intelligence; North Korea was not invited as a sitting temporary member of the UN, which violated UN Charter Article 32; and the fighting was beyond the UN Charter's scope, because the initial north - south border fighting was classed as a civil war . Because the Soviet Union was boycotting the Security Council at the time, legal scholars posited that deciding upon an action of this type required the unanimous vote of all the five permanent members including the Soviet Union . </P>

When did the un send troops to korea
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