The talks are likely to focus on bolstering a shaky ceasefire on the ground.
The two-day conference is aimed at bolstering a December 30 cease-fire ahead of the United Nations talks slated to begin February 23.
Previous efforts, which have involved indirect negotiations brokered by the U.N.'s envoy for Syria, resulted in little progress to resolve a war that began as peaceful protests against Assad before spiraling into a multi-party conflict. The Geneva talks scheduled for February 23 are expected to be wider-ranging and focus on key issues such as the fate of Syrian President Bashar al-Assad. On Monday, Russian Foreign Minister Sergei Lavrov said he welcomed closer engagement with Washington to fight "absolute evil" in Syria, according to Russian state news agency TASS.
Russia, Turkey and Iran sponsored in January the first direct negotiation between military formations and the Syrian government in this city and agreed to establish a tripartite mechanism to control ceasefire.
Muslit, however, said the opposition had yet to receive an agenda for the upcoming negotiations.
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The Kazakhstan talks were supposed to begin today but were postponed by one day.
Kazakhstan's Foreign Ministry did not offer an explanation for the change.
U.N. Syria envoy Staffan de Mistura, speaking in Italy, said he would apply the agenda laid out in a U.N. Security Council resolution aimed at ending the conflict.
This month, the Syrian regime and opposition groups swapped dozens of women prisoners and hostages, some of them with their children, in Hama province in northwestern Syria.
Salim Al-Muslit, spokesman for the High Negotiations Committee (HNC), said there could be no role for Al-Assad in the transition, saying "the heavy price paid by the Syrian people" would have been wasted if he remained.