Startled by the downing of its SU-24 fighter jet by Turkish air force near the Syrian coastal province of Latakia Tuesday, Russia has beefed up its anti-aircraft defenses in Syria by deploying the Moskva missile cruiser toward the coast, media reports said Friday.
Russia's War Against Ukraine
International Business Times: Moscow fortifies anti-aircraft defenses in Syria, deploys S-400 missiles

A file picture taken on Oct. 3, 2015 shows a Russian Sukhoi Su-24 bomber taking off from the Hmeimim airbase in the Syrian province of Latakia.