ANKARA, Aug. 27 (Xinhua) -- Presidents of Iran, Russia and Turkey will hold a trilateral summit in Iran on Sept. 7 as part of the Astana peace process over the Syrian crisis, the Turkish presidency said Monday.

The meeting between Turkey, Russia and Iran, the three guarantors of a cease-fire deal in Syria, comes ahead of increasing international efforts in reaching a solution to the Syrian crisis.

The summit will be held in the northern Iranian city of Tabriz, according to broadcaster TRT Haber.

The three countries have been mediating a peace process for the Syrian crisis since 2016.

Ankara has been urging against an impending military operation by the Syrian forces targeting the rebel-held Idlib Province, citing concerns of civilian casualties and a possible refugee influx toward Turkish border.

The Syrian government, backed by Russia, aims to clear Idlib of militants, who have been controlling the province since early 2017.

The latest trilateral summit of Astana process was held in Ankara in April, with the participation of Russian President Vladimir Putin and Iranian President Hassan Rouhani.