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The U.S. Enters a New Phase in Syria

Since it initiated air strikes against the Islamic State in Syria in 2014, the United States has tried to insulate its war against ISIS from the civil war among Bashar Assad’s regime, Syrian rebels, and the parties’ respective foreign allies. That effort always had its limits, but it formally came to an end in an unprecedented series of U.S. attacks on regime forces and their Iranian backers in recent weeks.