Russia, Iran and Turkey, the sponsors of peace talks between Syrian rebels and Damascus, agreed Tuesday to establish a joint "mechanism" to monitor the frail truce in the war-torn country. 

The sides have agreed to "establish a trilateral mechanism to observe and ensure full compliance with the ceasefire, prevent any provocations and determine all modalities of the ceasefire," according to a final statement read by Kazakh Foreign Minister Kairat Abdrakhmanov following the talks in Astana.