The Koni class is the NATO reporting name for an anti-submarine warfare frigate built by the Soviet Union. They were known in the Soviet Union as Project 1159. 14 were built in Zelenodolsk shipyard between 1975 and 1988. They were originally intended to replace the older Riga-class frigates, but were instead chosen as a design for export to various friendly navies. The Koni I sub class were designed for European waters and the Koni II were made for warmer waters.^[3] One ship was retained by the Soviets in the Black Sea for training foreign crews. Only a few of these vessels remain in service today.

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Quick Facts Class overview, General characteristics ...

Class overview
Name	Koni class (Project 1159)
Operators	Soviet Navy  Algerian National Navy  Bulgarian Navy  Cuban Revolutionary Navy  Volksmarine  German Navy  Egyptian Navy  Libyan Navy  Yugoslav Navy  Navy of Serbia and Montenegro
Preceded by	Mirka class
Succeeded by	Gepard class
Built	1975–1988
Completed	14
Active	5
Lost	1
General characteristics
Type	Frigate
Displacement	1,140 tons (standard) 1,900 tons (full load)[1]
Length	95 m (311 ft 8 in)
Beam	12.8 m (42 ft 0 in)
Draft	5 m (16 ft 5 in)[2]
Propulsion	CODAG 1 gas turbine M8V DN59L4 unit 13.4 MW + 2 diesels 3 shafts; 35,000 shp (26,000 kW) total[1]
Speed	27 knots (50 km/h; 31 mph)
Range	3,300 km (1,800 nmi; 2,100 mi) at 26 km/h (14 kn; 16 mph)
Complement	110[1]
Sensors and processing systems	Radar barret-2, Slim Net, Strut curve, pop group, Hawk Screech, Drum Tilt Sonar - Herkules hull mounted & dipping sonar
Armament	1 × 4K33 "Osa-M" launcher (20 missiles) 4 × P-15M Termit anti-ship missile launchers 2 × twin 76.2 mm dual purpose guns 2 × twin 30 mm guns 2 × RBU-6000 Depth charge launchers provision for 20 naval mines

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The Romanian Tetal-class corvettes were similar.

On July 16, 1998 the former Cuban Navy Koni II-class frigate designated 353 was scuttled in shallow water near the Cuban resort town of Varadero in the Parque Submarino Cayo Piedra del Norte as an attraction for divers. It is rumored that Fidel Castro promoted the project, being an avid diver himself. The frigate sank upright, and sits on the sand bottom in 90 ft (27 m) of water. For an unknown reason her hull number was changed from 353 to 383 prior to the scuttling.^[6] The dive operators in the Varadero area refer to the dive site as Patrol Boat 383 or simply P.B even though it is a frigate.

• Soviet Union - 1 (to Bulgaria in 1990), Delfin was originally used for training foreign crews in the Black Sea, before being sold to the Bulgarian Navy, currently in service as Smeli (Bulgarian: Смели" ("Brave")).
• Algeria - 3, in service, being upgraded with new electronics, ASW torpedo tubes and 8 x Kh-35 Uran/SS-N-25 Switchblade anti-ship missiles
• Cuba - 3, 356 (No name) ex SKR-471 sunk as a reef, 353 (later 383) (Monkada or Moncada) ex SKR-451 sunk as a reef^[6] and 350 (Mariel) ex SKR-28 status unknown.
• East Germany / Germany - 3, two (Rostock and Halle) taken over by unified German Navy and paid off August 1991, one (Berlin - Hauptstadt der DDR) immediately put up for disposal in 1991.^[7]
• Libya - 1 (formerly 2), 4 x 406mm torpedo tubes, status unknown, damaged by bombing May 19/20 and on August 9, 2011. (Al Ghardabia). The remaining ship, Al Hani captured by National Transitional Council in Benghazi, and has become the flagship of the reorganized Libyan Navy. She has been stuck in Malta for refit since 2013.
• Yugoslavia - acquired two ships, Split (VPBR-31) and Koper (VPBR-32), during the 1980s.

• List of ships of the Soviet Navy
• List of ships of Russia by project number