"Kremlin spokesman Dmitry Peskov said that the coordinates of that point were given by Turkish side: ".

"Unfortunately, our military, while carrying out strikes on terrorists, was guided by coordinates given to them by our Turkish partners, and Turkish servicemen should not have been present on those coordinates", Peskov told a conference call with reporters.

Turkish Deputy Prime Minister Numan Kurtulmus says Thursday's Turkish casualties were the result of "faulty coordination" in Syria and that "the struggle there shows that there is a need for a much closer coordination".

General Staff of the Turkish Army denied Russia's information about bombing Turkish soldiers in al-Bab on February 9.

Russian President Vladimir Putin and his Turkish counterpart Tayyip Erdogan spoke over the phone after the incident and agreed to step up military coordination against Daesh.

The Turkish military said Turkey and Russian Federation were conducting a joint investigation into the bombing.

The Russian Defense Ministry said the strike was meant to hit Islamic State targets.

"The Russians intervened to control the situation", Reuters reported an official fighting in support of the government as saying.

Turkey and Russian Federation back opposing sides in the Syrian conflict, with Moscow supporting the Assad regime but Ankara pushing for the president's ouster.

The Britain-based Syrian Observatory for Human Rights said the clashes were fierce in the area, where government troops made a significant advance Thursday.

The deaths added to a heavy toll suffered by Turkish troops embroiled in an increasingly complicated and bloody fight to help Syrian rebels capture al-Bab from the Islamic State. "There had not to be Turkish soldiers". "It has been understood that closer coordination is required, both with the coalition and with Russian Federation".