"In Korea the Government forces, which were armed to prevent border raids and to preserve internal security, were attacked by invading forces from North Korea. The Security Council of the United Nations called upon the invading troops to cease hostilities and to withdraw to the 38th parallel. This they have not done, but on the contrary have pressed the attack. The Security Council called upon all members of the United Nations to render every assistance to the United Nations in the execution of this resolution. In these circumstances I have ordered United States air and sea forces to give the Korean Government troops cover and support. The attack upon Korea makes it plain beyond all doubt that Communism has passed beyond the use of subversion to conquer independent nations and will now use armed invasion and war."

President Harry S. Truman, statement on the situation in Korea, Washington D.C., 27 June 1950. Issued two days after North Korean forces crossed the 38th parallel into South Korea on 25 June 1950.