The United Nations special envoy for Syria, Staffan de Mistura, is warning the entirety of eastern Aleppo could be destroyed by Christmas if the ongoing bombing campaign by Russia and the Syrian government is not stopped. In a speech in Geneva, he called on Russia and the Syrian government to stop the airstrikes.

Staffan de Mistura: “In the eyes of the world and of the public opinion, are you really ready to continue this type of level of fighting using that type of weapons and, de facto, destroy the whole city, eastern city of Aleppo, ancient city of Aleppo, with its own 275,000 people, for the sake of eliminating 1,000—1,000—al-Nusra fighters?”

Staffan de Mistura also said he’d personally accompany al-Nusra fighters out of Aleppo if that would end the Russian and the Syrian government’s bombing campaign, which he warned could become “another Srebrenica, another Rwanda.”