Russian-led peace talks on Syria were derailed today as rebels backed by Turkey boycotted a third round of meetings in Kazakhstan. The Kremlin indicated there were international divisions over the process. <br/><br/>Russia, Syrian President Bashar al-Assad's most powerful ally, said the rebels' reasons for staying away were unconvincing and their decision came as a surprise. Describing the rebels as Turkish proxies, the Syrian government envoy said, Ankara had broken its commitments to the Astana process.<br/>'<br/>The rebels said, they would not attend the talks, scheduled for today and tomorrow, because of what they called Russia's unwillingness to end air strikes on rebel-held areas and its failure to get the Syrian army and Iranian-backed militia to abide by a ceasefire.<br/>'<br/>Two previous rounds of Astana talks have sought to consolidate that ceasefire, reflecting an improvement in Russian-Turkish ties that had been strained to breaking point by the Syrian war.<br/>