NICE, France—The world knows North Korean supreme leader Kim Jong Un as a ruthless dictator prone to testing ballistic missiles while playing a game of nuclear chicken with President Donald Trump. He’s so cold-blooded he had his uncle and half-brother, among others, assassinated.

Kim is as unpredictable as he is deadly. Witness his announcement Tuesday that North Korea would participate in the Winter Olympics in Pyeongchang, South Korea. Experts said that Kim may be trying to do an end run around President Trump by reaching out to the South in the hope of breaking its ties with the U.S.

Baby-faced evil genius and master strategist at 34? (His birthday was Monday.)