Russia announced on Monday that extremists had attacked its naval and air bases in Syria on Saturday.
The assailants used drones to launch their attack, reported Russian agencies.
The Russian Defense Ministry said there were no casualties or damage as a result of the attacks, which involved thirteen armed drones, on its Hmeimim air base and Tartus naval base in western Syria, the agencies reported.
The ministry said last week that two Russian service personnel were killed in a mortar attack on the Hmeimim base on December 31.
