Russian President Vladimir Putin called long-standing ally Bashar al-Assad on Monday to inform him that Moscow will pull out the bulk of its forces from Syria, a move hailed by the United Nations Security Council as a "positive step" for the fraught peace negotiations.
But hopes for a breakthrough at the Geneva talks remained remote with both sides locked in a bitter dispute over the future of the Syrian president.
The withdrawal of the Russian troops -- which began airstrikes in support of the regime in September, sparking condemnation from Western powers -- is expected to put more pressure on Assad to negotiate during the Geneva talks.
As the meeting enters its second day, UN envoy Staffan de Mistura was expected to hold his first official meeting with the Syrian opposition High Negotiations Committee (HNC), who have repeatedly said that Assad could not be part of Syria's political future.
"That's what we like to see."
The Russian ambassador to the United Nations Vitaly Churkin and German Foreign Minister Frank-Walter Steinmeier also said the Kremlin's move would boost chances of a diplomatic solution to the conflict that has killed more than 270,000 people and displaced millions.
The White House said President Barack Obama had spoken to Putin following Russia's surprise withdrawal announcement, and discussed the "next steps required to fully implement the cessation of hostilities".
"At this point, we are going to see how things play out over the next few days," a senior administration official told AFP.
Russia began its airstrikes in support of Assad's forces in September, a move that helped shore up the regime's crumbling forces and allow them to go on the offensive.
