The Turkish Foreign Ministry summoned on Wednesday the United States charge d'affaires to voice its disappointment over Washington's arming and training of the Kurdish People's Protection Units (YPG) in Syria, sources from the ministry said.
Russia will continue constructive cooperation with Turkey for Syrian course, but it will not give up fighting against terrorist groups such as al-Nusra, Russia's Izvestiya newspaper reported Thursday quoting anonymous Russian officials.
Ankara and Moscow have many times not been seeing eye to eye on Syrian conflict since they have different interests in the region. In May 2017, Deputy Prime Minister Nurettin Canikli called the supply of weapons to the Kurdish forces "unacceptable".
In May of previous year, as President Donald Trump and Erdogan met, a brawl erupted in Washington outside the Turkish ambassador's residence.
In October, the YPG and their allies announced the capture of ISIL's self-declared capital of Raqqa in Syria after a four-month operation.
Russia's defence ministry had asked the Turkish military on Wednesday to tighten control over armed groups in Idlib after two groups of drones attacked Russian bases on January 6.
Turkey has been fiercely opposed to Syrian President Bashar al-Assad during his country's six-year-old civil war but has recently been working with his allies Russian Federation and Iran for a political resolution to the conflict.
Turkish Foreign Minister Mevlut Cavusoglu alleged earlier that Syria's government forces had been delivering strikes on the units of the so-called opposition in the Idlib province "under the guise of fighting terrorists". "If you are guarantors, which you are, stop the regime", Cavusoglu said.
Violence in Idlib region has recently escalated, with Syrian government forces, supported by Russian Federation, trying to regain control of the rebel-held area.