UN Syria envoy Staffan de Mistura has spoken to officials from Iran, Russia and Turkey over the planned formation of Syria's constitutional committee.

UN Syria envoy Staffan de Mistura said in a statement after talks in Geneva that "During the meeting, constructive exchanges and substantive discussions took place on issues relevant to the establishment and functioning of a constitutional committee, and some common ground is beginning to emerge".

The UN envoy noted that more such talks are planned in the coming weeks.

Iran, Russia and Turkey have mediated nine rounds of crisis resolution talks between the Syrian government and opposition in the Kazakh capital Astana since January 2017, a month after they joined efforts and brought about an all-Syria ceasefire.

The Astana peace process has significantly helped reduce the violence in Syria through the formation of four de-escalation zones in the country, setting the stage for Syria’s warring sides to focus on negotiations on the political future of their homeland.

Syria has been gripped by militancy caused by multiple factions and groups since March 2011. The Syrian government says the Israeli regime and its Western and regional allies are aiding Takfiri terrorist groups that are wreaking havoc in the Arab country.

In recent months, Takfiri militants have lost much of the territory they once held in Syria. UN figures show that the number of people internally displaced in the violence-hit country has risen to 6.2 million. This is while there are still some 5.6 million Syrian refugees in neighboring countries.

Hundreds of thousands of people have lost their lives during the conflict.