According to the Russian Foreign Ministry citing reports, at least 18 civilians were killed and dozens injured in a US-led coalition airstrike on a settlement in Syria's Raqqa province on December 7.
"These reports cause deep concern. Air and missile strikes that result in deaths and suffering of peaceful Syrians are unacceptable and deserve decisive condemnation. The suffering of civilian population must be stopped," the ministry said in a statement.
The Russian Foreign Ministry added that it is hard to understand statements about "errors" and "negligence" from those whose military operation in Syria had not been requested by the country's legitimate authorities.
Last week, the Pentagon stated that the US-led coalitions airstrikes on the Syrian army positions were an "unintentional, regrettable error."
Earlier, the Russian Defense Ministry slammed the US-led coalition for striking civilians instead of terrorists.
"Weddings, funerals, hospitals, police departments, humanitarian convoys and even Syrian troops, fighting against Daesh terrorists near Deir ez-Zor, become targets for coalition airstrikes," spokesman Maj. Gen. Igor Konashenkov said, commenting on an alleged US-led coalition's member's strike on a Syrian village in north Aleppo that claimed at least six lives.