USA's involvement in the Korean War (getting the UN involved)

Truman immediately sent advisers, supplies and warships to Korea. He knew he needed the support of the UN so he put pressure on them to condemn the actions of the North Koreans and withdraw troops. The USA was the single biggest contributor to the UN budget and therefore had the biggest influence. Normally, the Soviet Union would have used their veto to block the call for action by the UN. However they were boycotting the UN at this time over another issue.