Contemporary research has shown that the motivation on the Communist side was complex. When the North Korean leader Kim Il-sung asked Stalin’s approval for the invasion in April 1950, the Soviet dictator encouraged him. He had learned from the defection of Tito two years earlier that first-generation Communist leaders were especially difficult to fit into the Soviet satellite system that he thought imperative for Russia’s national interest. Starting with Mao’s visit to Moscow in late 1949—less than three months after the People’s Republic of China was proclaimed—Stalin had been uneasy about
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