Another week, another series of crises in the exhausting if not quite yet exhausted presidency of Donald Trump. Like a hurricane over dry land, the administration seems to be losing strength as it whirls and spins across unfavorable terrain. Because Mr. Trump’s power both at home and abroad is based more on the fears people have about the consequences of opposing him than on their agreement with his objectives or their admiration of his methods, his weakened political position has translated into diminished diplomatic authority.

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