Representatives from Russia, Iran and Turkey met in Kazakh capital Astana on Monday to discuss the implementation and enforcement of the ongoing ceasefire in Syria, local media said.
The UN and Jordan -the latter for the first time- also sent officials to the meeting.
Russia, Turkey and Iran had formed a trilateral mechanism in a meeting in January to uphold the ceasefire declared between the Syrian government and opposition on 30 December 2016.
The sides are expected to meet in Geneva on 20 February. Uncertainty still remains over whether some groups, such as the Kurdish Democratic Union Party (PYD) and groups representing the autonomous administration in Northern Syria will be invited to Geneva, due to objections by Turkey.