With Suleimani’s death, the months-long tit-for-tat cycle of pressure and provocation between Washington and Tehran has entered a much more dangerous phase. The risk of a regionwide conflagration is higher than ever. Shortly before the strike, U.S. Secretary of Defense Mark Esper threatened preemptive action to protect U.S. forces, saying "the game has changed." But this is not a game—and the stakes for both sides could not be higher.”

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