NATO member Turkey has conducted a diplomatic balancing act since Russia invaded Ukraine, criticising the invasion but opposing Western sanctions on Russia.
A Turkish defence ministry source said jets were never used in Syrian, Russian or U.S. airspace for the latest airstrikes on Kurdish militant bases in Syria, and that jets hit all targets from within Turkish airspace.
"Turkish jets used the airspace under the control of the United States and Russia.
"The Turks coordinated with the Russians and the Americans in the areas they have control over Syrian airspace," said Colonel Abduljabbar Akaidi, a senior Syrian opposition figure familiar with the latest developments.
Turkey, the United States and others deem the PKK a terrorist group.