TOKYO (AP) — Kim Jong Un put on a command performance this week at a gathering of some two dozen world leaders in China, striding with confidence and a broad grin across one of the biggest international stages of his 14-year career as North Korea's leader.

As Kim returns home Friday, his time in Beijing marks a stunning transformation from his first tentative, violent years in power, when some analysts suggested the inexperienced young leader would struggle to survive .

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