"The Turkish-Russian cooperation is very important for Idlib," said UN envoy to Syria Stevan de Mistura, warning at the same time that the battle of Idlib, if it took place, would be bloody and would witness new levels of terror.

De Mistura said in a televised address from Geneva to the Security Council community on the situation in Syria that the Syrian forces and their associates are getting closer and closer to Idlib, although it is one of the areas to reduce the escalation.

The UN envoy stressed that any use of chemical weapons in Idlib would be absolutely unacceptable and should not happen again in Syria, pointing out that this is the position of UN Secretary-General Antonio Guterich.

Safe corridors
"People should be given a safe passage to the places they choose if they want to leave," he said, adding that "civilians will have no other Idlib to escape."

For her part, Britain's representative to the United Nations Karen Pearce said that her country supports the efforts of Turkey and the United States in the file of the Syrian province of Idlib, stressing London's support efforts to reach a peaceful solution to the crisis, and efforts to spare civilians in Idlib a humanitarian disaster.

The meeting coincided with the Tehran summit, which was attended by Iranian President Hassan Rowhani and his Turkish counterparts Recep Tayyip Erdogan and Russian Vladimir Putin.

The final communiqué of the summit called for the need to separate the armed opposition from "terrorist groups" and stressed the total rejection of attempts to find new pretexts on the ground under the pretext of fighting terrorism.