With a show of Stars and Stripes, U.S. forces in Syria try to keep warring allies apart

BEIRUT — The U.S. military is getting drawn into a deepening struggle for control over areas liberated from the Islamic State that risks prolonging American involvement in wars in Syria and Iraq long after the militants are defeated.

In their first diversion from the task of fighting the Islamic State since the U.S. military’s involvement began in 2014, U.S. troops dispatched to Syria have headed in recent days to the northern town of Manbij, 85 miles northwest of the extremists’ capital, Raqqa, to protect their Kurdish and Arab allies against a threatened assault by other U.S. allies in a Turkish-backed force.

Russian troops have also shown up in Manbij under a separate deal that was negotiated without the input of the United States, according to U.S. officials. Under the deal, Syrian troops are to be deployed in the area, also in some form of peacekeeping role, setting up what is effectively a scramble by the armies of four nations to carve up a collection of mostly empty villages in a remote corner of Syria.