The Administration is now pursuing what amounts to a strategy of intermittent military force combined with sustained economic pressure. Last week, it announced “Operation Economic Outcast,” an effort to further isolate Iran from its remaining trading partners. But the campaign has so far produced limited results, and imposing sanctions aggressive enough to cripple Iranian trade could require confronting countries including China, India, and Russia.

Secretary of State Marco Rubio said this week that the Administration expected the principal pressure on Iran going forward to be economic, while reserving the right to use military force when…

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