Russia and Iran, which back the Syrian regime, and opposition supporter Turkey will look to work out more details of the "de-escalation zones", including the thorny issue of who will police the northern Idlib region, the Kazakh foreign ministry said in a statement.
"The participants also intend to confirm the maps of the de-escalation zones in the provinces of Idlib, Homs and Eastern Ghouta," it said.
The statement did not mention a fourth zone in the south of Syria, where Israel and the United States have been wary about seeing Iran involved after a ceasefire was agreed between Moscow and Washington in July.
Moscow has been spearheading the Astana peace talks since the start of the year in a bid to pacify Syria after its game-changing intervention on the side of President Bashar al-Assad.
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