U.S. Secretary of State Rex Tillerson (L) meets with Turkish President Recep Tayyip Erdogan in Ankara, Turkey, on Feb. 16, 2018. Turkey and the United States have agreed to surmount their differences on Syria during a critical visit of Secretary of State Rex Tillerson to Ankara amid tension between the NATO allies, but experts said that there is no miracle solutions to resolve quickly the strained ties. (Xinhua)