Yes, they managed to prevent the loss of South Korea.
Yes, North Korea is an active member of UN.
The UN fought in Korea.
No, the UN, (including the US), and South Korea were fighting North Korea and China, (who had some help from the Soviet Union).
Kim Jong-un has ruled in North Korea for about 4 years.
China sent troops to help North Korea. The UN states
The UN invasion in Korea, known as the Incheon Landing, occurred on September 15, 1950, during the Korean War. It took place at the port city of Incheon, located on the west coast of South Korea. The operation aimed to recapture Seoul and turn the tide against North Korean forces, which had invaded South Korea earlier that year. The successful landing marked a significant turning point in the conflict.
The current dictator of North Korea is Kim Jung Un 김정은 (as of 2014).
The US is a member of the UN and the UN agreed to assist South Korea aginst North Korea.
they wanted to defend south Korea and restore peace
The UN fought North Korea, Red China. The US was part of the UN.
South Korea! North Korea consists of a lack of food and Kim Jong Un
The United States was successful in containing Communism in South Korea.