The Friends of Syria group is meeting in London to try to keep next month's proposed Syria peace conference on track.
William Hague and his counterparts from 10 other countries are considering how to support the Syrian opposition ahead of the summit due to take place in Geneva.
Failure to agree a united front could jeopardise the chances of the conference, scheduled for Switzerland on November 23, even taking place.
Geneva II is intended to build on last year's Geneva agreement in which most parties to the conflict, including Russia, signed up to a rough road map intended to lead to peace.
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