During the Korean War, the United Nations (UN) played a critical role by forming a multinational coalition to support South Korea against North Korean aggression. Following the invasion of South Korea by North Korea in 1950, the UN Security Council quickly passed resolutions condemning the invasion and calling for member states to provide military assistance to South Korea. Led primarily by the United States, the UN forces aimed to repel the North Korean advance and restore peace. The UN's involvement marked a significant moment in its history, reflecting the organization's commitment to collective security in the wake of World War II.