David Cameron has made a statement after concluding talks with Vladimir Putin in Sochi, Russia.
The prime minister said: "We have had very substantive, very purposeful, very useful talks today.
"We discussed the appalling and deteriorating situation in Syria. Millions of lives lost, millions more fleeing their homes.
"The history of Syria is being written in the blood of their people. It's no secret that we've had differing views on how to handle the situation.
"But we share fundamental aims to end the conflict, to stop Syria fragmenting, to let the Syrian people choose who governs them, and to prevent the growth of violent extremism."