The U.S. military is moving ahead with its plans to withdraw all troops from Syria, in keeping with a White House directive in December, even though a U.S.-Turkey rift appears likely to delay the pullout, defense officials said.

White House national security adviser John Boltonsaid this week that the U.S. wouldn’t leave Syria until Turkey promised not to target the U.S.’s Kurdish partners, provoking a furor during his visit to Ankara and throwing the withdrawal plan into turmoil.

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