Powered by a modern gas turbine engine, the Udaloy II is equipped with more capable sonars, an integrated air defense fire control system, and a number of digital electronic systems based on state-of-the-art circuitry. The original MGK-355 Polinom integrated sonar system (with NATO reporting names Horse Jaw and Horse Tail respectively for the hull mounted and towed portions) on "Udaloy"-I ships is replaced by its successor, a newly designed Zvezda M-2 sonar system that has a range in excess of in the 2nd convergence zone. The Zvezda sonar system is considered by its designers to be the equivalent in terms of overall performance of the AN/SQS-53 on US destroyers, though much bulkier and heavier than its American counterpart: the length of the hull mounted portion is nearly 30 meters. The torpedo approaching warning function of the Polinom sonar system is retained and further improved by its successor.