“We are carrying out work together with the Russians and the Iranians to prevent the catastrophe which took place in Aleppo from repeating in Idlib,” Erdogan told a Thursday ceremony in Ankara, referring to the Syrian army’s 2016 retaking of Aleppo from militants supported by a number of foreign countries, including Turkey.

Erdogan spoke a day after meeting with Iranian Foreign Minister Mohammad Javad Zarif and ahead of a planned meeting between the Iranian, Russian and Turkish leaders next month, The Republic reported on Thursday.

In his Thursday remarks, Erdogan also hailed his country’s “success in destroying a corridor” for Takfiri terrorists along its border with Syria, highlighting Turkey’s concern over the operation of the Tahrir al-Sham (formerly al-Nusra Front) terrorists in Idlib.

Iran, Turkey and Russia are the guarantors of a cease-fire regime in Syria, which was agreed upon in the Astana Peace Process.

The three guarantor states initiated the Astana Process on January 23, 2017, establishing de-escalation zones in an effort to restore calm in the region and improve the humanitarian situation in war-torn Syria.