Turkey says Syria settlement needs Assad
Turkish Deputy PM expresses optimism for peace talks in Astana.
Turkey says it can no longer insist on any settlement for Syria's long-running war without President Bashar Assad.
Deputy Prime Minister Mehmet Simsek speaking in a panel discussion at the World Economic Forum in Davos, Switzerland, said facts on the ground have now changed dramatically in Syria.
He expressed optimism for Syrian peace talks planned next week in Astana, Kazakhstan.