Buyan class corvette

Buyan-class corvette (pr 21630) Buyan-M-class corvette (pr 21631)
Class overview
Name:	Buyan class or Project 21630
Builders:	Almaz Shipyard, St. Petersburg
Operators:	Russian Navy
Succeeded by:	Karakurt-class corvette
Subclasses:	Project 21631 "Buyan-M" Project 21632 "Tornado"
Building:	4
Planned:	15
Completed:	8
Active:	8
General characteristics
Type:	Corvette
Displacement:	500 tons standard (project 21630) 949 tons full (project 21631)
Length:	62 m (203 ft) (21630) 75 m (246 ft) (21631)
Beam:	9.6 m (31 ft) (21630) 11 m (36 ft) (21631)
Height:	6.57 m (22 ft)
Draft:	2 m (7 ft) (21630) 2.5 m (8 ft) (21631)
Propulsion:	2 shaft CODAD, 4 x Zvezda M520, 14,584 shp (10,880 kW), Pumpjet.
Speed:	28 knots (52 km/h; 32 mph) (21630) 26 knots (48 km/h; 30 mph) (21631)
Range:	1,500 nmi (2,800 km; 1,700 mi) (21630) 2,300 nmi (4,300 km; 2,600 mi) at 12 knots (21631)
Endurance:	10 days
Complement:	29-36 (21630) 52 (21631)
Sensors and processing systems:	Radar: MR-352 Pozitiv-M1.2 phased array radar system (Pozitiv-ME1.2 for export) Fire Control: 5P-10-03 Laska (5P-10-03E for export) Sonar: Anapa-M suite (Anapa-ME for export) Navigational Radar: MR-231 Pal Other: 1 x electro-optical surveillance device
Electronic warfare & decoys:	2 × PK-10 decoy launchers
Armament:	1 × 100 mm A-190 2 × 30 mm AK-630 (AK-630-M2 in 21631) 1 × 40 retractable A-215 "Grad-M" (only 21630) 2 × 4 UKSK VLS cells with Kalibr-NK system or P-800 Onix (only 21631) 1 × 4 3M47 Gibka (only 21630) 2 × 4 Komar (only 21631) 1 × DP-65 anti-saboteur grenade launcher 2 × 14.5 mm KPV type 3 × 7.62 mm PKM type (only 21631)

The Buyan-class corvette was designed by Zelenodolsk Design and designated Project 21630 by the Russian Government. This is one of the newest corvettes of the Russian Navy. The first ship of her class, Astrakhan, was commissioned in September 2006, and assigned to the Caspian Flotilla.

In August 2010 some information about newly modified Project 21631 ships was published. The lead ship of this project, Grad Sviyazhsk, was laid down on 27 August 2010. This ship is a missile version of Project 21630 "Buyan" small-size gunnery ship and is dubbed as "Buyan-M". This ship of Project 21631 is dedicated to the defense of national economic zones and its main purpose is engagement of surface warships. This is going to be an up-to-date ship armed with missile and artillery weapons, and equipped with electronic countermeasure equipment. The Buyan-M class corvettes are said to be armed with nuclear-capable Kalibr cruise missiles (NATO code name Sizzler) with a claimed range of at least 1,500 km.

The yard will build five ships including the lead one, since a contract was approved by the Russian defense ministry on 26 May 2010.

One of the export variants of Project 21630, called Project 21632 "Tornado", will be purchased by Kazakhstan.

In October 2015, Grad Sviyazhsk, Uglich and Velikiy Ustyug in company with the Gepard-class frigate Dagestan, launched cruise missiles at targets in Syria. The missiles flew nearly 1,500 kilometres (930 mi) over Iran and Iraq and struck targets in Raqqa and Aleppo provinces (controlled by the Islamic State) as well as Idlib province (controlled by the al-Qaeda-linked Nusra Front). According to Pentagon officials, several of these Kalibr-NK cruise missiles fired from Russian ships crashed in Iran and didn't make it to their intended targets in Syria. Iranian TV reported that an "unidentified flying object" crashed and exploded in a village near the Iranian city of Takab.