Mevlut Cavusoglu said US forces are leaving “pockets” with IS militants intact to justify continued cooperation with the Kurdish militia.
Cavusoglu said ties with the US are “at a critical stage” and that Washington needs to take “concrete steps” to regain Turkey’s trust.
Ankara is riled over Washington’s support for the Syrian Kurdish People’s Protection Units, or YPG — the top US ally in the anti-IS fight.
Turkey considers the YPG a “terrorist” group linked to Kurdish insurgents within Turkey.
US Secretary of State Rex Tillerson is due in Ankara later this week.