To date, though, there has been no one opposition leader or group that has spoken for all those pitted against the Damascus government, and there is little indication of a coherent, agreed-upon plan for Syria should al-Assad and his regime fall.

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Given that both companies agreed to extend the trial to more markets is an early indication that the arrangement is working out.

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Both he and Mr Lavrov agreed that a negotiated end to the conflict was still possible but neither man gave indication of ways out of the impasse.

BBC: Syria faces 'hell' if no deal to end crisis - UN envoy