Ankara accuses US -based Turkish cleric Fethullah Gulen of masterminding the putsch and has repeatedly asked Washington for his extradition.
While the U.S. views the Peoples' Protection Units (YPG) militia as the most effective fighting force on the ground against Islamic State (IS) extremists, Ankara calls it a "terrorist" organisation linked to outlawed Kurdish militants in Turkey. Ankara considers the regime offensive, supported by Iran-backed militias and Russian air power, aims to recover more territory from the rebels.
The Russian Foreign Ministry said the issue was discussed with the UN Special Envoy for Syria Staffan de Mistura during his recent visit to Moscow.More news: Cameron White replaces Chris Lynn in Australia's ODI squad for England series
Earlier Russia's Ambassador to Ankara Alexei Yerkhov and Iranian Ambassador Mohammad Ebrahim Taherian Fard were summoned to the ministry for the same reason.
Turkey on Wednesday called on Russian Federation and Iran, the two chief allies of President Bashar al-Assad's regime in Syria, to halt an air offensive on the rebel-held Idlib province near the Turkish border. The drones were sent from Idlib, an area controlled by so-called "moderate opposition" units, the Russian defence ministry's official newspaper Krasnaya Zvezda said Wednesday.
Turkey-US relations strained over the latter's support for the PKK/PYD terror group's presence and arming of the group in the region.
Turkey has summoned a senior American diplomat in Ankara to explain reports that United States troops have started training a new border force in Kurdish-held northeastern Syria.