Syrian fighters backed by Turkey waged battles on Friday against Kurdish forces near the town of Ain Issa in northern Syria, where Russian and Turkish troops jointly patrol a key highway.
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Turkish forces and their Syrian insurgent allies seized territory in the region in an offensive last year against the Kurdish YPG militia which holds swathes of north and east Syria.
Ankara's Western allies widely condemned that incursion, which was halted when Turkey reached separate deals with Washington and Moscow, the second of which agreed to establish the joint Russian-Turkish patrols.
