Reuters - Turkey and Russia agreed on Wednesday that their next three-way summit with Iran to discuss the conflict in Syria will be held in Istanbul, a Turkish presidential source said.

The source said Turkish President Tayyip Erdogan and Russia’s President Vladimir Putin also agreed in a telephone call to speed up the establishment of military observation posts in Syria’s Idlib region, and discussed the humanitarian situation in eastern Ghouta, near Damascus.

Reporting by Tulay Karadeniz; Writing by Ece Toksabay; Editing by Dominic Evans