REUTERS

Submarine is equipped with the same missiled used by Russia's Caspian flotilla to strike targets in Syria in mid-November, according to Reuters.

Rostov-on-Don B-237 submarine (NATO codename “Improved Kilo”) boasts advanced stealth technologies and an extended combat range, armed with 533mm torpedoes and reportedly Kalibr-PL (submarine modification) water-to-surface cruise missiles.

Read alsoRussia launches naval bombardment of ISIS targets in Syria - media The sub can spend 45 days in isolation at sea.

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Vladimir Putin’s spokesman said the Kremlin is not aware of any subsea military activity near Syria, as these questions should be addressed to the Ministry of Defense.