Turkey, Russia and Iran – the guarantor countries of a cease-fire agreement in Syria – will meet in Astana next week, Kazakhstan's Foreign Ministry said yesterday.

The meeting will take place on Monday, a day before the fifth round of Astana talks to resolve the situation in Syria.

Beside guarantor countries, representatives from the Syrian regime, the armed opposition and observer states are also expected to attend.

Agenda items include the borders of de-escalation zones, documents regulating the activities of control forces and provisions for a coordination center, the Kazakh ministry added.

During a meeting in the Kazakh capital on May 4, the three countries signed a deal to establish de-escalation zones in Syria.

Turkey, Iran and Russia previously agreed on the decision of the establishment of de-escalation zones in Idlib, parts of Aleppo, Latakia and Homs, Damascus/Eastern Ghouta and parts of Daraa and Quneitra.

Turkey, Russia and Iran are working on a mechanism of de-escalation zones in Syria involving the U.S. and respective zones assigned to each country, presidential spokesman İbrahim Kalın said last week, adding that the Astana and Geneva processes will continue in order to establish permanent peace in Syria.

Turkey and Russia have played a key role in establishing a nationwide cease-fire in the war-torn country and later agreed on the evacuation of Aleppo in late December 2016. After that, along with Iran, the three countries took the initiative to bring together the Syrian regime and opposition in Astana to sustain a cease-fire agreement and to negotiate a political transition in the country.

They will also plan regulations on the release of detainees and prisoners, and the search for missing people.