The announcement comes as leaders from Russia, Turkey and Iran meet in Sochi for a summit on the Syrian conflict.

Russia has told Turkey it has no right to create a “safe zone” inside Syria unless it sought and received the consent of President Bashar al-Assad, signalling tensions as a three-way summit on the Syrian conflict began.

President Vladimir Putin, one of Assad’s closest allies, was hosting the summit in the Black Sea resort of Sochi on Thursday to discuss the future of Syria with Turkish President Tayyip Erdogan and Iranian President Hassan Rouhani.

All three countries have forces on the ground in Syria where they have coordinated their efforts despite sometimes differing priorities and interests.

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But a planned withdrawal of the US forces from Syria, announced by President Donald Trump in December, has engendered new tensions between Moscow and Ankara in particular.

Turkey wants to set up what it calls a safe zone in northeast Syria, parts of which are now controlled by the US forces, and for the area near the Turkish border to be cleared of the US-backed Kurdish YPG militia.

But speaking before the start of the Sochi summit on Syria, a Russian Foreign Ministry spokeswoman said Ankara would need Assad’s green light to create any safe zone inside the Syrian borders.

“The question of the presence of a military contingent acting on the authority of a third country on the territory of a sovereign country and especially Syria must be decided directly by Damascus,” Maria Zakharova said in answer to a question about the Turkish safe zone plan. “That’s our base position.”

But that is likely to be an unappealing prospect for Erdogan, who has called for Assad to step down after years of civil war that has shattered his country.

Idlib pressure

The Kremlin on Thursday also made clear that its patience with Turkey over a joint deal to enforce a demilitarised zone in the northwestern Idlib region was running short.

Moscow and Ankara brokered the deal in September, saying they wanted the region free of heavy weapons and fighters. The agreement helped avert a government assault on the region, the last major bastion of Assad’s opponents.

But Moscow has since complained that the armed groups that used to belong to the al-Nusra Front are now in control there and wants military action to drive them out.

Ankara is less keen as it is concerned about potential refugee flows from Idlib in the event of a military operation, and wants to retain its influence in the region on its border.

It also does not want developments in Idlib to distract from its plan to set up a safe zone in the northeast.

Kremlin spokesman Dmitry Peskov said Moscow wanted action on Idlib, referring to the “continued presence there of terrorist groups”.

“… Implementing the decision on Idlib is one of the overall components in our policy to stabilise Syria to definitively create the conditions for things to move onto a political settlement,” said Peskov, who made clear Putin would press Erdogan on the subject later on Thursday.

Speaking in Sochi on Thursday, Erdogan said Turkey wanted to move in coordination with Russia on a planned safe zone in northern Syria and added that Syria’s territorial integrity could not be established as long as the Syrian Kurdish YPG militia is not cleared from the area.