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.