The UN special envoy to Syria has told the BBC he's optimistic that talks on resolving the conflict in Syria will go ahead. But Staffan de Mistura warned that the date they're set to begin - January 25th - may slip. He says Syrians should lead the talks - and outside players like the US and Russia should support that, rather than disagreeing over who can take part. He spoke to our Chief International Correspondent Lyse Doucet in Davos, where he's attending the world economic forum.
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