- Immediately after the invasion, the UN started their "police action".
- The United States responded by pushing a resolution through the U.N.'s Security Council calling for military assistance to South Korea. With this resolution in hand, President Harry S. Truman rapidly dispatched U.S. land, air, and sea forces to Korea to engage in what he termed a "police action."
- The American intervention turned the tide, and U.S. and South Korean forces marched into North Korea