Agencies (Qasioun) - Russia has accused the US-led coalition of bombing the Syrian city of Raqqa "off the face of the earth" during the fight against so-called Islamic State.
Syrian Democratic Forces (SDF) took Raqqa last week and on Sunday said they had taken Syria's largest oilfield.
Pictures suggest much of Raqqa is in ruins, and Moscow compared it to the Allied destruction of the German city of Dresden in World War Two.
The US-led coalition says it tried to minimise risks to civilians.
Russia has itself been accused of committing war crimes for its bombardment of Aleppo last year.
UN war crimes investigators said last week that there had been a "staggering loss of civilian life" in Raqqa.