Has the United Nations ever had to intervene in any conflict involving South Korea?

Yes, the United Nations intervened in the Korean War, which began in 1950 when North Korea invaded South Korea. The UN Security Council passed resolutions calling for military assistance to South Korea, leading to a multinational force, primarily composed of U.S. troops, being deployed to defend South Korea. This intervention was significant in shaping the course of the conflict and ultimately led to an armistice in 1953, though a formal peace treaty was never signed. The UN has since played a role in monitoring the ceasefire and facilitating dialogue between the two Koreas.