After talks with Moscow's top diplomat, Syria's main opposition group insisted Friday that Russia is "not clinging" to President Bashar al-Assad.
The head of Syria's National Coalition, Khaled Khoja, met Thursday with Russian Foreign Minister Sergei Lavrov as part of a fresh push by Moscow to find a way out of the four-year civil war that has cost some 240,000 lives.
Moscow - one of Assad's few remaining backers - is pushing a plan for a broader grouping than the US-led coalition fighting the Islamic State (ISIS) group, to include Syria's government and its allies.
But Khoja - in Moscow for the National Coalition's first talks there since February 2014 - reiterated that Assad must go immediately and hinted that Russia's support for the strongman may be wavering.
"We have found that the Russian authorities are not clinging to Bashar al-Assad personally, but rather they're clinging to the Syrian state, its territorial integrity, and the preservation of its institutions," Khoja told journalists at a press conference.
A spokeswoman for Russia's foreign ministry said in response that Moscow's position remained unchanged.
"We have always said that we do not support Assad in a personal capacity but that we support the legitimately elected president of Syria," spokeswoman Maria Zakharova told AFP.
The ministry said in a statement that Russia was pushing the National Coalition - Syria's main opposition group in exile - to talk to other
parties in the fragmented opposition about the creation of a cohesive negotiating platform for talks with the authorities.
The meeting Thursday is part of a broader diplomatic flurry that saw Saudi Arabia's foreign minister Adel al-Jubeir fly into Moscow on Tuesday, on the back of a three-way Russian-Saudi-US meeting in Doha earlier this month.
The top diplomat for Saudi Arabia, a key backer of the Syrian opposition, rejected calls to work with Assad against ISIS after a meeting with Lavrov.
As part of the push, Lavrov was also expected to meet on Friday with the head of a newer grouping of Syrian opposition figures known as the Cairo Conference Committee.
On Wednesday, Russia's top Middle East envoy met in Moscow with Salih Muslim, the head of the Syrian Kurdish Democratic Union Party (PYD).