The talks in Geneva under UN envoy Staffan de Mistura come amid concerns that he and other UN officials have expressed about a looming battle for northern Idlib province the last remaining rebel stronghold in Syria after 7 years of war that is now home to some 3 million civilians.
Asked whether Iran shared concerns about a possible humanitarian catastrophe in Idlib, Jaberi Ansari replied: "We are worried too. We we are trying to avoid this." Russian President Vladimir Putin's special envoy for Syria, Alexander Lavrentiev, declined to answer a question on his way into the talks about whether Russia would stop its airstrikes.
De Mistura met informally with members of the three delegations on Monday.
The talks are set to focus on creating a constitutional committee under Syria's Russian- and Iranian-backed government. Russia, Turkey and Iran have been working together as "guarantors" for a series of talks around ending Syria's war. Turkey has taken in 3.5 million refugees from its neighbour.
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