"I cannot say whether reports that such actions have already started are true, but we are ready for coordination - that I can confirm," Lavrov said on Tuesday commenting on the statement of a representative of the Kurdish Democratic Union Party that soon an active phase an offensive at Raqqa will start with participation of Kurds, the United States and Russia.

"Raqqa is one of the aims of the anti-terrorist coalition, just like Iraq’s Mosul. We are confident that these cities could have been liberated more effectively and faster if our military officials (of Russia and US) would have started coordinating their actions much earlier," the foreign minister noted.

"There is a chance now that such coordination will take place. We think that Russian Aerospace Defense Forces and US-led coalition’s aviation should work synchronously, in coordination, and help those on the ground to really resist terrorist units. First of all, among them [forces on the ground] are, of course, armed forces of the Syrian Arab Republic, and, of course, different groups of Kurdish forces, including the armed part of the Democratic Union Party," Lavrov said.