Turkey on Friday accused its Nato ally the United States of "unacceptable" behaviour after US commandos in Syria were pictured assisting a Kurdish militia that is branded a terror group by Ankara and even wearing their insignia. The scathing accusations of "hypocrisy" and "double standards" levelled by Foreign Minister Mevlut Cavusoglu came after an AFP photographer saw US troops in Syria wearing insignia of the Kurdish People's Protection Units (YPG). Ankara regards the YPG as a terror group, accusing it of carrying out attacks inside Turkey.