
"Kim Jong-un is a pale reflection of his father and grandfather. He has not had the decades of grooming and securing of a power base that Jong-il enjoyed before assuming control from his father," said Bruce Klingner, an Asia policy analyst at the Heritage Foundation in Washington.
"(He) may feel it necessary in the future to precipitate a crisis to prove his mettle to other senior leaders or deflect attention from the regime's failings."
Video from Chinese state television showed residents weeping in the North Korean capital Pyongyang. KCNA reported people were "writhing in pain" from the loss of the man who in 1994 assumed the leadership of the totalitarian state from his father Kim Il-sung, the North's first, and officially eternal, president.
News of the death of the man whose push to build a nuclear arsenal left the North heavily sanctioned and internationally isolated, triggered immediate nervousness in the region, with South Korea stepping up its military alert.
China, the North's neighbor and only powerful ally, said it was confident the North would remain united and that the two countries would maintain their relationship.