A senior aide to Syrian president Bashar al-Assad has flown to China to discuss the crisis.
Chinese foreign ministry spokesman Qin Gang said that Bouthaina Shaaban would meet foreign minister Yang Jiechi later today.
In a statement he said that China had always "actively balanced its work between the Syrian government and the opposition".
He repeated China's call for the "practical implementation" of former UN envoy Kofi Annan's defunct peace plan and for "an immediate ceasefire".
"Receiving Shaaban in China is part of the above-mentioned work by the Chinese side,
"China is also considering inviting Syrian opposition groups in the near term to China."