The Kim dynasty inherited a devastated country at the end of the Korean War in 1953. Its cities were levelled and at least a million people had been killed. The Chinese troops who had helped North Korea went home after the war, but the American troops stayed in South Korea. Moreover, the Americans had nuclear weapons and would not promise not to use them—and there was no peace treaty, just an armistice.
What does Kim Jon-un want? One thing: security. Photograph courtesy of Wikipedia