Talks between some of the opposition and the Syrian government have ended in Moscow with each side blaming the other for a lack of progress.
Analysts say the Kremlin organized the weeklong negotiations in a bid to raise its international standing at a time of tensions with the West over Ukraine.
But the main Western-backed opposition group --the Syrian National Coalition -- refused to attend the Moscow talks amid distrust of Russia's intentions.
The Russian mediator of the talks, Vitaly Naumkin, said the sides failed to agree a final document after disagreeing over measures to build mutual trust.
Russia has strongly backed Syrian President Bashar Assad's government throughout the country's civil war.
The conflict -- now in its fifth year -- has killed more than 220,000 people and has turned nearly 4 million into refugees.