Three months of Russian airstrikes in Syria have killed more than 2,300 people, a third of them civilians and over 100 of them children.
Russia began conducting its air war in Syria on 30 September in support of embattled ally President Bashar al-Assad.
According to the Syrian Observatory for Human Rights, Moscow's strikes on Syria have killed 2,371 people so far.
The toll includes 792 civilians, among them 180 children.
The raids killed 655 fighters from the Islamic State extremist group, which Russia says it is targeting along with "other terrorist groups".
Another 924 opposition fighters - ranging from US-backed rebels to members of al-Qaeda's Syrian affiliate and IS rival al-Nusra Front - were also killed in the Russian strikes.
The Britain-based Observatory has an extensive network of sources inside Syria.
Russia, a US-led coalition and the Syrian air force are all carrying out air raids in the country, but the Observatory differentiates between strikes based on the type of aircraft flown and the munitions used.
Russia has come under growing criticism from rebels, human rights groups, and the West for inflicting civilian casualties.
Amnesty International last week said Russian raids had killed hundreds of civilians, many in targeted strikes that could constitute war crimes.
|Read more: Russian raids in Syria may amount to war crimes|
US State Department spokesman Mark Toner echoed the accusations on Tuesday, saying Russian strikes have "killed hundreds of civilians, including first responders, (and) hit medical facilities, schools and markets."
More than 250,000 people have been killed since Syria's conflict erupted in March 2011 with anti-government protests.
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