No foreign power should be permitted to interfere in the ongoing Syrian peace talks in Geneva, the lead government negotiator said, denying that high-level US-Russian meetings in Moscow will impact the process.

"When we say that the dialogue must be between Syrians, without outside intervention, this also applies to the Russians and Americans," Bashar al-Jaafari told AFP in an interview.

His comments came as US Secretary of State John Kerry was heading to Moscow for talks with President Vladimir Putin and Foreign Minister Sergei Lavrov, hoping to build momentum for the Syrian peace drive.