Ankara and Washington insist officially that there are no differences between them concerning the situation in Syria, in particular over the fight against the Islamic State (IS). All signs, however, indicate otherwise.
Tensions between the two have resurfaced over the question of US arms supplies to the Kurdish Democratic Union Party (PYD) in Syria to help it fight IS. Washington has air-dropped arms to the PYD despite disapproving grumblings from Ankara, which has been trying, to no apparent avail, to prevent this from happening because it considers the PYD to be a terrorist organization.