Moscow, Tehran and Ankara, the sponsors of the negotiations in the capital of Kazakhstan, announced they would "establish a trilateral mechanism to observe and ensure full compliance with the ceasefire" in place since late December.
The three powers also backed the participation of the armed rebel groups at a new round of peace talks set to be hosted by the United Nations in Geneva next month.
"There is no military solution to the Syrian conflict and... It can only be solved through a political process," the final statement by Russia, Iran and Turkey, read out by Kazakh Foreign Minister Kairat Abdrakhmanov, said.
The meeting was expected to see the first face-to-face negotiations between the regime and the armed opposition since Syria's conflict erupted in 2011, but the rebels backed out and mediators were forced to shuttle between the two sides.
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The latest diplomatic initiative to end the bloodshed in Syria that has cost 310,000 lives comes one month after regime forces, aided by Russia and Iran, dealt a crushing blow to the rebels by retaking full control of the country's second city Aleppo.
The rebels -- who insisted they would use the Astana talks to push Damascus to respect the truce -- refused direct talks with the regime yesterday because of its continued bombardment and attacks on a flashpoint outside the Syrian capital Damascus.
Regime negotiator Bashar al-Jafaari said after the end of the talks that the meeting "succeeded in achieving the goal of consolidating the cessation of hostilities for a fixed period paving the way for dialogue between Syrians."
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