 He further demanded that the safe zone be expanded to 32 km, rather than the 5-9-14 model being implemented at that point by the U.S. and SDF.On 12 September, the U.S. military was reported as considering the proposition of sending about 150 additional troops to Northern Syria in an attempt to "reduce tensions" between the SDF and Turkey.A Pentagon spokesman however stated that the U.S. "posture" in Syria would remain "unchanged".