It was a UN Operation (Police Action).
Yep, it was a UN operation, authorized by the Security Council while the USSR (Stalin) was boycotting and not on hand to provide a veto. There were many countries involved, but out of all the non-ROK sources we provided more than 90% of the troops, funds, and blood. A few years before I was born my eldest brother, on occupation duty in Japan, largely untrained and wholly inexperienced, was killed during the retreat to the Busan Perimeter. We were always concerned that my dad might make a trip to Independence, MO to “discuss” things with a retired Harry Truman.