Russian attack jets have hit 51 Islamic State targets in Syria in the past 24 hours, including four command posts, six arms depots, a mortar battery, two underground bunkers, 32 field camps and six outposts.
The strikes took place in the Latakia, Aleppo, Hama and Damascus provinces.
The damage the Russian SU-34 jets caused to the underground bunkers was especially significant, Defense Ministry spokesman Major General Igor Konashenkov said.