The deployment of U.S. Marines to the region prompted disputes between Turkey and the United States. One of the central issues is the question whether U.S. troops should back the Syrian Democratic Forces (SDF) which are dominated by the PYD and its military wings, the YPG and the all female YPJ, or whether the U.S. troops should back Turkish-led fighters under the umbrella of the so-called Free Syrian Army (FSA). The dispute happens as Turkish, Syrian, Russian, and U.S. troops and the various factions are preparing the assault on an estimated 4,000 fighters of the Islamic State (a.k.a. ISIS, ISIL, IS, Daesh) who are controlling the city of Raqqa. Any of these troops, the newly deployed U.S. Marines included, are entering a highly contested and highly congested theater. The contingent of U.S. Marines arrives Thursday. Their role is to provide artillery support, most probably for the SDF which already have U.S. Special Forces and “advisers” deployed among their ranks.
After the arrival of the U.S. troops on Thursday, Turkey’s Foreign Minister Mevlut Cavusoglu warned that Turkish forces would strike the PYD’s YPG/YPJ forces in Manbij. This would imply that Turkey would carry out strikes against forces which already have Special Forces from Turkey’s NATO ally USA amidst their ranks. However, Cavusoglu argued that the Kurdish occupation of the town of Manbij and or Raqqa are a hindrance to what he describes as Turkish efforts to carve out a safe zone in northern Syria. Cavusoglu gave no deadline though for an attac but accused Washington of being confused in its planning for an attack on the IS stronghold of Raqqa.