"We welcome [Russia's readiness to establish contacts with the FSA] and do not object to the meetings with Russian officials, but on the condition of ceasing airstrikes on positions of FSA units and the civilian population," Masri said.
He added that FSA leaders have been ready for dialogue with Moscow since the beginning of the civil war and have put forward proposals to send a high-level delegation to the Russian capital.
Since the beginning of the campaign, the Russian Defense Ministry has stressed that Russian aircraft are fitted with equipment allowing them to conduct "absolutely precise" airstrikes against Islamic State throughout Syria, to evade civilian casualties.
Last week, Syrian Ambassador to Russia Riad Haddad confirmed that Syrian Army strikes, supported by the Russian Air Force, were carried out against armed terrorist organizations and not political opposition factions or civilians.