The Trump administration is making a serious mistake. Late Sunday night, it released a statement declaring that Turkey would be “moving forward with its long-planned operation into Northern Syria” and that American forces “will no longer be in the immediate area.” The practical result of this statement is obvious: Turkey now has an American permission slip to conduct an invasion into Kurdish territory, kill American allies, and carve out a zone of dominance that will further inflame and complicate one of the world’s most dangerous regions.

There are no easy answers in Syria. While the ISIS caliphate is in ruins, ISIS itself is still potent and active in both Syria and Iraq. The Syrian Civil War grinds on, and the conflict between the Turks and the Kurds has festered for decades. American forces are in a perilous place, but their presence not only helps maintain momentum in the fight against ISIS, it also deters further genocidal bloodshed in northern Syria. The United States should have an exit strategy, but one that neither squanders our tactical gains against ISIS nor exposes our allies to unacceptable retribution.