– IS under pressure –
The Russian strikes have so far killed at least 808 IS fighters, according to the Observatory, though they have also killed moderate and Islamist fighters and civilians, it says.
More than 3,700 IS jihadists have also been killed in US-led coalition strikes that began in Syria in September 2014.
On Sunday, the Observatory said 40 civilians including eight children had been killed in strikes on the IS bastion of Raqa city.
The monitor said it was unclear if the strikes were carried out by regime or Russian planes.
In recent months, IS has come under pressure particularly from Kurdish fighters backed by US strikes, and more recently regime forces supported by Russian air raids.
On Saturday, at least 16 IS fighters were killed in a failed attack on a government position in Aleppo province, where loyalist troops and pro-regime fighters have been advancing towards the group’s stronghold of Al-Bab.
Regime forces are now within 10 kilometres (six miles) of Al-Bab, and are seeking to sever IS-held territory in Aleppo province from that held by the group in neighbouring Raqa.
Analysts say the group regularly seeks to open new offensives when it is under pressure elsewhere.
More than 260,000 people have been killed in Syria since the conflict began in March 2011 with anti-government protests.
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