Russia has continued its bombing campaign in Syria for a fifth day, targeting at least 10 positions of the Islamic State militant group, according to its defence ministry.
"As a result of our air strikes on Isil [IS] targets, we have managed to disrupt their control system, the terrorist organisation's supply lines, and also caused significant damage to the infrastructure used to prepare acts of terror," the ministry said.
However, Syrian opposition groups say the Russian forces focussed on targeting other rebel groups and that civilians had died in the attacks.
Meanwhile Syria's President Bashar al Assad said the coalition between his country, Russia and Iran were united in fighting terrorism and unlike the US-led coalition would achieve "practical results".
He said if the coalition doesn't succeed "the whole region will be destroyed".
However several countries condemned Russia's intervention.
Turkey's President Recep Tayyip Erdogan said backing Syria's Assad was a grave mistake that would further isolate Moscow.
Prime Minister David Cameron said Russia's actions would lead to further radicalisation and terrorism.
"Tragically, what has happened is that most of the Russian air strikes, as far as we have been able to see so far, have been in parts of Syria not controlled by Isil (IS) but controlled by other opponents to the regime.
"So what is happening is that they are backing the butcher Assad, which is a terrible mistake for them and for the world; it's going to make the region more unstable, it will lead to further radicalisation and increased terrorism.
"And I would say to them: change direction, join us in attacking Isil but recognise that if we want to have a secure region, we need an alternative leader to Assad. He can't unite the Syrian people."
But the Kurdistan Regional Government's President Massoud Barzani on Saturday called on Russia and the US-led coalition to work together to achieve "better results".
Mr Barzani said his government would welcome assistance for his troops from any country, including Russia.
"If there is coordination and cooperation between the international coalition and Russia against Daesh, that will achieve better results," he said in the statement, using an Arabic name for Islamic State.
"The Kurdistan region... welcomes Russia if it supports the peshmerga in the fight against Daesh".