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It's crucial to avoid the collapse of the US-Russia agreements on Syria, meaning a fair and impartial investigation of the Aleppo and Deir ez-Zor incidents is needed, Russian Foreign Minister Sergey Lavrov said at the UN General Assembly in New York.

"The main thing now is to prevent the collapse of those arrangements [between Russia and the US], objectively and impartially investigate the undermining incidents in Deir ez-Zor and Aleppo, particularly, that there's many who want to sabotage the agreed approaches to the Syrian settlement," Lavrov said during the general debate at the 71st Regular Session of the United Nations General Assembly in New York.

Earlier in September, US-led coalition planes bombed Syrian government troops in Deir ez-Zor, and a few days later a UN humanitarian convoy was attacked in Aleppo.

The minister stressed that "it's essential to fulfill the UN Security Council [UNSC] demand to dissociate the so-called moderate opposition from the terrorists. Here, special responsibility rests with the US and the members of their coalition."

"Their refusal or inability to do this in the present circumstances can't but strengthen the suspicion that it's being attempted to remove Jabhat al-Nusra out of harm's way and that the plans for a regime change are still on the table," he said, adding that it would be a "grave violation" of the UNSC resolution.