Buyan

The Buyan class covers Russian Project 21630 artillery ships and the larger Project 21631 Buyan-M missile corvettes. Zelenodolsk Design Bureau developed the family for coastal and riverine operating areas, especially the Caspian Flotilla and other shallow-water theatres. The design reflects a Russian preference for small ships that can move through inland waterways while still carrying useful naval weapons.

The original Project 21630 ships emphasized patrol and gunfire roles, while Buyan-M added larger displacement, reduced signatures, and UKSK vertical launch cells for Kalibr-family cruise missiles. That changed the class from a local patrol combatant into a strategic signalling platform. Its small size limits endurance and sea-keeping, but inland mobility and missile reach gave it influence beyond normal corvette expectations.

Buyan and Buyan-M ships became prominent because they can operate from constrained seas and still contribute to long-range strike campaigns. Their operational value depends on geography: they are more persuasive in sheltered waters and river-connected fleets than in blue-water escort missions. For HiWars, the class is important as an example of modern missile firepower being packed into a small combatant.