In interviews with a half-dozen participants, it is clear Mr. Trump’s failed gambit was the culmination of two years of threats, hubris and misjudgment on both sides. Mr. Trump entered office convinced he could intimidate the man he liked to call “Little Rocket Man” with tough talk and sanctions, then abruptly took the opposite tack, overruling his aides and personalizing the diplomacy.
Mr. Kim also miscalculated. He bet Mr. Trump might accept a more modest offer that American negotiators in Hanoi had already dismissed: The North would dismantle the Yongbyon nuclear complex, three square miles of aging facilities at the heart of the nuclear program, for an end to the sanctions most harmful to its economy, those enacted since 2016.
It is unclear whether Mr. Trump was tempted to take that deal, which could have turned headlines away from the damaging testimony of his former lawyer, Michael D. Cohen, in Washington.
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