Syrian President Bashar al-Assad has said a coalition between Syria, Russia, Iran and Iraq must succeed “or else the whole region will be destroyed”.
Mr Assad also criticised the US-led coalition and its air strikes in Syria and Iraq as counter-productive, saying that terrorism had only spread.
Meanwhile, Russia has carried out more air strikes in Syria it says targeted so-called Islamic State (IS) positions.
Syrian activists say the raids appear to have focused on other rebel groups.
In an interview with Iranian state television, reported by the Syrian presidency Twitter feed, President Assad said Syria, Russia, Iran and Iraq were united in battling terrorism and would achieve “practical results”, unlike the US-led coalition.