Why did the communist leaders feel they had scored a victory in Korea?

After the cessation of hostilities in the Korean peninsula in the 1950s, Communist leaders could (and often did) feel that they had scored a victory inasmuch as they had secured territory (the new nation of North Korea) for the Communist cause. Even more, the powerfully Communistic government controlling North Korea became a new ally of the Communist cause, thereby strengthening that cause against the alliance of nations aligned with the United States and other anti-Communistic powers.