WASHINGTON — After North Korea threatened on New Year’s Day to test an intercontinental ballistic missile, Donald J. Trump, then president-elect, reacted with characteristic swagger. He vowed to stop the North from developing a nuclear weapon capable of hitting the United States. “It won’t happen!” he wrote on Twitter.
But six weeks later, after North Korea defiantly launched a missile into the sea, Mr. Trump, now president, reacted with surprising restraint. Appearing before cameras late at night on Saturday in Florida with his golfing guest, Prime Minister Shinzo Abe of Japan, Mr. Trump read a statement of just 23 words that pledged American support for Tokyo without even mentioning North Korea.
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