Russia and Iran have backed Syrian regime while Turkey has supported its foes, but, despite the differences, they struck a deal in 2017 to set up de-escalation zones in Syria, helping reduce fighting.

Turkey has became the guarantor of some "moderate" rebel groups, while Iran and Russia is responsible for the acts of Syrian government.

Ankara and Moscow have many times not been seeing eye to eye on Syrian conflict since they have different interests in the region.

Turkey is irked with Russia for inviting Syrian Kurdish militia, the Peoples' Protection Units (YPG), which controls much of northeast Syria but is viewed by Ankara as a terror group and offshoot of the Kurdistan Workers' Party (PKK), to the planned meeting in Sochi.

Russia failed to convene the gathering over Turkey's objection about YPG's participation. Parties are still carrying on talks for the list of participants.

Elaborating on Ankara's concerns on the recent offensive in Idlib, Turkey is concerned on three negative outcomes, a Turkish official told Xinhua on condition of anonymity.

The Syrian regime's attacks on "moderate opposition" could cause throwback to Russian initiated national dialogue meeting in Sochi, because the talks aim peace negotiations also with those rebel groups, said the official.

Furthermore, the offensive could lead to collapse of Astana process and eventually the hardly established cease-fire in de-escalation zones.

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