What was General MacArthur willing to expand in an effort to bring an end to communism in Asia?

Since there would be no war against China or with the USSR, which also supplied war materials to North Korea, MacArthur's actions were meant to end communism only in North Korea or, force North Korea into a speedy surrender. It's quite probable, that North Korea would remain under communist control. Truman feared an extended war that might involve the entire Chinese. It was doubtful that the USSR would enter the war which was a United Nations war.