Beirut - The Syrian Observatory for Human Rights said on Tuesday that Russian air strikes had killed 2 132 people in Syria, a third of them civilians, since they began on September 30.
Of those killed, 598 were fighters from the Islamic State group and another 824 from Al-Nusra Front, the Syrian affiliate of al-Qaeda, and other rebel groups.
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There were a further 710 civilians killed, of whom 161 were children and 104 women.
The Britain-based Observatory has an extensive network of informants inside Syria. It bases its tallies on Russian-caused casualties by the type of aircraft flown and the munitions used.