United Nations Security Council

The United Nations Security Council was the central international forum for the response to North Korea’s invasion of South Korea in June 1950. Its resolutions called for North Korean forces to withdraw and then supported the use of armed force, giving the crisis an unprecedented collective dimension: for the first time, a world organization voted to use force to stop force.

Acheson’s initiative

When Dean Acheson informed Harry S. Truman that North Korean forces had crossed the 38th parallel in a heavy attack, he had already acted on his own initiative to notify the United Nations Secretary-General and request a Security Council meeting. The move brought the invasion before an international body even as the American government was still assessing the attack and considering its implications.

The first resolution

The Security Council met that afternoon and adopted an American resolution calling for an immediate cessation of hostilities and the withdrawal of North Korean forces to the 38th parallel. The vote was nine to zero. The Soviet Union cast no vote: its representative, Jacob Malik, had walked out earlier in the year after the Council refused to unseat Nationalist China, and had not returned. His absence meant that the Soviet Union did not exercise its veto during this first response.

Support for armed force

The Council subsequently debated a resolution supporting the American decision to respond. It adopted the resolution at 10:45 that night, again with the Soviet Union absent. The book marks this as a historic institutional step: never before had a world organization voted to use armed force to stop armed force. The Council’s action thus extended beyond calling for a ceasefire and withdrawal; it supplied international backing for the use of force in Korea.

Significance

The sequence of resolutions made the Council’s role both practical and symbolic. Its first demand set out an immediate objective—halt the fighting and restore the boundary—while its later vote endorsed collective armed action. Truman framed the decisions made by his administration as being for the United Nations, arguing that the organization could not fail in its first major test. The Soviet representative’s continued absence shaped the circumstances of both votes, while the Council’s decision established an unprecedented precedent for international action against an invasion.