During a Tuesday meeting in Tehran, the two sides discussed the agenda of the seventh round of Astana talks which is slated to be held in the Kazakh capital soon.
The two senior negotiators also discussed the latest developments in the de-escalation zones and new proposals for the establishment of lasting peace in Syria.
Syria has been gripped by civil war since March 2011 with various terrorist groups, including ISIS still controlling parts of it.
According to a report by the Syrian Centre for Policy Research, the conflict has claimed the lives of over 470,000 people, injured 1.9 million others, and displaced nearly half of the country’s pre-war population of about 23 million within or beyond its borders.
In the meantime, Iran and Russia have remained a close ally of Syria and support its legitimate government in the face of foreign-backed militancy.
Tehran insists that the Syrian nation is the only side that has the right to shape the future of its own country, rejecting foreign intervention with the use of force.