Buyan-M

Russia's small, shallow-draft cruise-missile corvette — a roughly 950-tonne hull that can slip through inland rivers to redeploy between fleets and fire Kalibr land-attack missiles a thousand kilometres or more. It conducted the first combat use of the Kalibr against Syria in 2015 and has been one of the principal platforms for Russia's missile strikes on Ukraine.

Overview

The Buyan-M (Project 21631) is a class of twelve small missile ships — in NATO terms, guided-missile corvettes — built for the Russian Navy. Designed by the Zelenodolsk Design Bureau and constructed at the Zelenodolsk Shipyard in Tatarstan, they are the missile-armed evolution of the gun-armed Project 21630 Buyan. Their defining feature is an eight-cell vertical launcher firing the Kalibr family of cruise missiles, which gives a hull displacing under 1,000 tonnes a strategic land-attack reach normally reserved for far larger warships. Because they are small and shallow-draft, they can transit Russia's interconnected rivers and canals to move between the Caspian, Black Sea, Baltic and Northern fleets — a mobility that, combined with the Kalibr's range, has made them a persistent strike threat well beyond the coastlines they were nominally built to defend.

Development

Plans for a missile-armed derivative of the Buyan gunboat surfaced in August 2010, adding the UKSK vertical-launch system for the nuclear-capable Kalibr and extra electronic-warfare gear, according to Wikipedia. The lead ship, Grad Sviyazhsk, was laid down on 27 August 2010 and commissioned on 27 July 2014. A particular attraction of a small, river-mobile cruise-missile ship was the Cold War–era Intermediate-Range Nuclear Forces Treaty: the INF banned land-based medium-range missiles but not sea-based ones, so a corvette able to redeploy through inland waterways could carry such weapons without falling under the treaty's restrictions. Production ran for fifteen years and was repeatedly delayed by sanctions: the class was originally specified with German MTU diesels, and after the 2014 sanctions cut that supply Russia switched first to Chinese engines and ultimately to domestic Kolomna diesels, as documented by Overt Defense. The twelfth and final hull, Stavropol, was commissioned into the Baltic Fleet on 28 August 2025, completing the program; later production shifted to the newer Karakurt class (Project 22800).

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