Only a deal between Russia and America can help to solve the Syrian conflict according to the Royal United Services Institute (RUSI), as the US and Turkey look set to drive Isis out of Raqqa.
Turkish President Recep Tayyip Erdogan said on Wednesday that President Barack Obama is ready to use joint action to capture Raqqa, which is currently held by Isis. Yesterday Syrian government forces were accused of dropping bombs containing chlorine in Aleppo injuring 80 people, but reports have not been verified.
Michael Stephens, a research fellow with the Royal United Services Institute, told Julia Hartley-Brewer that "the need to reduce Islamic State territory in Syria is quite urgent and it needs to be done in order to show there's progress being made in the conflict.
"There is a huge amount of work being done to prepare for refugees coming from this country, and it's going to need a lot of partners on the ground.
"These tactics are still being used, unfortunately Syria keep sliding into further conflict and division, I don't see and end to it.
"Ultimately this is a deal that's got to be done by the Russians and Americans, I think all other parties are kind of secondary to the conflict at this point."
Listen to the full interview to find out more