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The Udaloy class, Soviet designation Project 1155 Fregat and Russian designation Project 11551 Fregat-M (Russian: Фрегат, 'Fregat' meaning Frigate), are series of anti-submarineguided-missile destroyers built for the Soviet Navy, seven of which are currently in service with the Russian Navy. Twelve ships were built between 1980 and 1990, while the thirteenth ship built to a modified design, known as Udaloy IIclass, followed in 1999. They complement the Sovremenny-class destroyers in anti-aircraft and anti-surface warfare operations. The codename Udaloy comes from an archaic Russian adjective удалой, meaning daring or bold.