"The conference will take place no earlier than December," a source close to today's three-way talks in Geneva between UN envoy Lakhdar Brahimi, the United States and Russia told Russia's ITAR-TASS news agency.
The news report provided no further details about progress in organising the Geneva peace conference.
Russia is represented at today's meetings with Brahimi by Deputy Foreign Ministers Mikhail Bogdanov and Gennady Gatilov.
The so-called Geneva II peace talks on the 31-month crisis were proposed in May during a meeting in Moscow between Russian Foreign Minister Sergei Lavrov and US Secretary of State John Kerry.
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But the conference has since been repeatedly delayed because of deep disagreements about who should be represented at the talks.
Recently, the word in diplomatic circles had been that the conference would be held on November 23, although the United Nations never confirmed the date.
Some powerful rebel groups have also made Syrian President Bashar al-Assad's ouster a condition for their attendance in Geneva -- a stance rejected by both Damascus and Moscow.