Udaloy-class destroyer

The Udaloy I class are a series of anti-submarine destroyers built for the Soviet Navy, eight of which are currently in service with the Russian Navy. The Russian designation is Project 1155 Fregat (Frigate bird). Twelve ships were built between 1980 and 1991, while a thirteenth ship built to a modified design as the Udaloy II class followed in 1999. It complements the Sovremenny class destroyer in Anti-aircraft warfare and Anti-surface warfare operations.

Design history
The Project 1155 dates to the 1970s when it was concluded that it was too costly to build large-displacement, multi-role combatants. The concept of a specialized surface ship was developed by Soviet designers. Two different types of warships were laid down which were designed by the Severnoye Design Bureau: Project 956 destroyer and Project 1155 large anti-submarine ship. The Udaloy class are generally considered the Soviet equivalent of the American Spruance class destroyers. There are variations in SAM and air search radar among units of the class. Based on the Krivak class, the emphasis on ASW left these ships with limited anti-surface and anti-air capabilities.

Udaloy II
Following Udaloy's commissioning, designers began developing an upgrade package in 1982 to provide more balanced capabilities. The Project 1155.1 Fregat II Class Large ASW Ships (NATO Codename Udaloy II), Russia's only multipurpose destroyer, is intended to be the Russian counterpart to the American Arleigh Burke class ships.

The Udaloy-II is modified by the replacement of the SS-N-14 by the SS-N-22, reflecting a change in emphasis from ASW to anti-shipping, however, her standoff ASW capability is retained by firing SS-N-15 missiles from the torpedo tubes. Other changes include an improved self defense capability with the addition of the gun/SAM CIWS systems. Similar to Udaloy externally, it was a new configuration with the Moskit antiship missiles, a twin 130 mm gun, the Udav antitorpedo system and several anti-aircraft systems.

Powered by a modern gas turbine engine, it was 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 100 km in the 2nd convergence zone. The Zvezda sonar system is considered by its designers to be the equivalent of American AN/SQS-53 in terms of overall performance, but it is much bulkier and heavier than its American counterpart: the length of the hull mounted portion is near 30 meters. The torpedo approaching warning function of Polinom sonar system is retained and further improved by its successor Zvezda sonar system.

In 2006 the Northern Fleet's Project 1155 Udaloy I-class destroyer Admiral Kharlamov was reported to have been laid-up for a planned overhaul and upgrade programme. In 2008 Admiral Chabanenko became the first Russian warship to transit the Panama Canal since World War II

In April 2010 Severnaya Verf shipyard announced that the destroyer Vice-Admiral Kulakov, which had been undergoing an overhaul since 1990, will rejoin Russia's Northern Fleet soon.