The UN's special envoy on Tuesday warned that all hope to resolve Syria's civil war would be lost if the latest attempt at peace talks failed, after the opposition said Russian airstrikes threatened to derail the discussions before they had begun.
The main opposition umbrella group attending the talks said Russia's "unprecedented" bombardment near Aleppo -- 270 raids since Monday morning, according to monitors -- threatened to scupper efforts to end the almost five-year conflict.
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