Trump’s personalization of foreign policy makes credible commitment next to impossible. If Trump is the only spokesperson, then his idiotic tweets matter, no matter how much his chief of staff, John Kelly, pretends they don’t. Trump wants to rally all of Asia around him to confront North Korea to coax Pyongyang into negotiations. It is extremely difficult to make that sale, however, if the sole person who matters keeps speaking erratically on the subject (or any subject). It also makes it next to impossible for North Korea to entertain negotiating with Trump.
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There is a reason every time Trump tries to flesh out his grand strategy, he fails miserably. His mixture of erratic security pledges, mercantilist economic policy and transactional values is less appetizing to the rest of the world than he realizes.
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As always, the primary success of Trump’s overseas trip is that he did not start World War III. Beyond that, anyone who is describing his Pacific Rim trip as a success is relying on the soft bigotry of low expectations.