President Vladimir Putin said on Thursday that Russia could scale up its military presence in Syria again within hours and would still bomb terrorist groups there despite a partial drawdown of forces ordered after military successes.

Speaking in one of the Kremlin's grandest halls three days after he ordered Russian forces to partially withdraw from Syria, the Russian leader said the smaller strike force he had left behind was big enough to help forces loyal to President Bashar al-Assad keep advancing.

"I'm sure that we will see new and serious successes in the near future," Putin told an audience of more than 700 members of the military at an awards ceremony. In particular, he said he hoped that the ancient city of Palmyra, which is held by Islamic State, would soon fall to Assad's forces.