High Quality Content by WIKIPEDIA articles! The Project 205 Moskit (mosquito) more commonly known by their NATO reporting name Osa, are a class of missile boats developed for the Soviet Navy in the late 1950s. Until 1962 has been classified as a large torpedo boat. The Osas are probably the most numerous class of missile boats ever built, with over 400 vessels constructed in 1960-1973 for both the Soviet Navy and for export to allied countries. "Osa" means "wasp" in Russian, but it is not an official name. The boats were designated as "large missile cutters" in the Soviet Navy.