Chocolate cake and chemistry repaired U.S.-China ties. But will North Korea kill the vibe?

After the relationship was sealed over "the most beautiful piece of chocolate cake you have ever seen" at Mar-a-Lago last week, it seemed China had gone from a threat and economic predator to a friend and partner of the new administration. But if Trump has flipped once, could he flip again? The answer to that question could lie in North Korea.
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