Russian Defence Ministry spokesman Igor Konashenkov said: "Over the past 24 hours, Sukhoi Su-34 and Su-24M fighter jets have performed 20 sorties and hit nine Islamic State installations. Russia has launched a blitz bombing campaign against enemies of Syrian president Bashar al-Assad in recent days. Putin has been accused of targeting the Western-backed Syrian Free Army and civilians instead of ISIS militants, a claim Russia rejects. Citing video taken of the latest strikes by a Russian drone, Konashenkov said it was clear his bombers had destroyed a large ISIS arms depot.