The United Nations has often been frustrated in performing its peacekeeping mission. It was however able to take action in Korea because .?

The United Nations was able to take action in Korea due to the absence of a Soviet veto in the Security Council, as the USSR was boycotting the council at the time. This allowed for the passage of resolution 83, which authorized military intervention to repel North Korea's invasion of South Korea in 1950. The swift international response, including troops led by the United States, was a significant moment in UN peacekeeping efforts.