Buyan-class

The Buyan-class program includes Project 21630 Buyan and the enlarged Project 21631 Buyan-M. These ships were designed for Russia's coastal, river-sea, and enclosed-sea operating environment, where shallow draft and access to inland waterways matter. The later Buyan-M variant became especially significant because it carried vertical-launch cruise missiles on a relatively small hull.

The class's design emphasizes shallow-water access, compact crew and machinery arrangements, and sufficient armament for patrol and strike tasks. The Buyan-M's most important design feature is its cruise-missile capability, which lets a small corvette threaten targets at long range. This creates a mismatch between hull size and strategic effect, although endurance, seakeeping, and air defense remain limited compared with larger warships.

In service, Buyan and Buyan-M ships fit Russia's need for distributed missile carriers in the Caspian, Black Sea, Baltic, and river-connected theaters. Their Kalibr role made them prominent during Russian strike campaigns, but recent naval warfare has also shown the danger small surface combatants face from drones and precision weapons. The class is therefore both capable and exposed: potent as a launcher, constrained as a survivable warship.