"I would like to repeat that unless we ensure security in all the regions controlled by the YPG [the Kurdish People's Protection Units] first of all, in Manbij, we will not stop," Erdogan said at the trilateral Russia-Turkey-Iran summit on Syria, Sputnik news agency reported.

He noted that the three guarantor states' leaders agreed on the necessity to preserve Syria's territorial integrity.

Earlier in the day, Russian President Vladimir Putin, Iranian President Hassan Rouhani and Erdogan held their second trilateral meeting on Syrian settlement in Ankara. Iran, Russia, and Turkey are the three guarantor states of the ceasefire in Syria, which has been mired in a violent civil war since 2011, and active participants of the Astana format of the Syrian reconciliation.

On March 28, the Turkish National Security Council warned that Ankara would push its operation in the northern district of Afrin further to Manbij, if the Kurdish YPG forces, supported by the United States, did not leave the region.

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