Smoke rises after airstrikes on Aleppo's Castello road, Syria June 2, 2016. REUTERS/Abdalrhman Ismail/File Photo
GENEVA (Reuters) - The United States is failing to stand up to Russia, which is committing "war crimes" in Syria, a leading Syrian opposition negotiator said on Sunday, as Russian-backed forces appeared to tighten the siege on the city of Aleppo.
"What we lack here is a serious reaction to Russian behaviour on the ground," said Basma Kodmani, a member of the main opposition High Negotiations Committee.
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