"[President Recep Tayyip] Erdogan is right," Senator Aleksey Pushkov, who heads the Russian Upper House Commission for Information Policy, said on Twitter. 

He added: "There are many facts showing that the U.S. supports extremist organizations. The efforts of the [U.S.] State Department to deny this obvious situation are absurd."

Erdogan said on Tuesday that the coalition forces have not kept their promises to Turkey regarding Operation Euphrates Shield.

"They said, 'We will make the utmost efforts to fight the ISIL extremist organization.' They even accuse us of giving support to ISIL," Erdogan told a news conference in the capital Ankara.

Erdogan added: "Quite the contrary, they give support to the YPG and PYD, including ISIL. It is quite loud and clear."

He also said there is documentary evidence of this, including pictures, photos, and videos.

The YPG is the armed wing of the PYD – the Syrian offshoot of the PKK, which is designated a extremist organization by Turkey, the U.S., and the EU.

While Turkey views the PYD and YPG as extremist groups, Washington has supported the YPG as an "effective partner" in the fight against ISIL.

Operation Euphrates Shield began in late August to rid Syria's northern border area of extremists. Tuesday marks day 126 of the operation.

Since the start of the operation, more than 1,000 ISIL extremists have been "neutralized," according to an earlier briefing by Turkey's defense minister.