What major event did the United Nations engage in for the first time during the Korean War?

During the Korean War, the United Nations took the unprecedented step of engaging in military intervention during an international conflict. This marked the first occasion in which the UN not only called for the collective response of its member states but also authorized military action to confront aggression. When North Korea invaded South Korea in 1950, the UN Security Council quickly convened and passed a resolution that led to a multinational force, predominantly composed of U.S. troops, being deployed to assist South Korea.

This military intervention showcased the UN's ability to act decisively in situations where peace and security were threatened, establishing a precedent for future UN actions in conflict zones. As a result of this intervention, the UN became actively involved in military operations, reflecting its role as an international body aimed at maintaining peace and preventing further escalation of violence.