Moscow slammed the United States for accusing Russia of "barbarism" and war crimes in Syria as Russian and Syrian warplanes continued to bomb rebel-held areas of Aleppo.

Kremlin spokesman Dmitry Peskov, said that, "We note the overall unacceptable tone and rhetoric of the representatives of the United States, which can damage and harm our relations."

British Ambassador Matthew Rycroft said that, "In short, it is difficult to deny, that Russia is partnering with the Syrian regime to carry out war crimes." In addition, incendiary munitions "indiscriminate in their reach" were being used against Aleppo civilians.

US Ambassador Samantha Power accused Moscow of "barbarism".

According to the Syrian Observatory for Human Rights, at least 124 people, mostly civilians, have been killed in the bombardment of rebel-held eastern Aleppo since the army on Thursday announced an operation to take the country's second city.

"Moscow is not losing the hope and political will to use maximum efforts to reach the point of political settlement in Syria," Peskov said. "So far it's been hard."

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