The Buyan class (Russian: Буян, lit. 'Buyan'), Russian designations
Project 21630 Buyan and Project 21631 Buyan-M , are series of
corvettes (small artillery and missile ships in Russian classification)
developed by Zelenodolsk Design Bureau for the Russian Navy. Since 2010, all
subsequent vessels are being constructed as improved Project 21631 subclass,
incorporating greater tonnage, stealth technology and the 3S14 vertical
launching system for either Kalibr or Oniks anti-ship cruise missiles,
significantly enhancing combat capabilities. The ships are primarily designed
for operations within littoral zones to protect Russia's vast coastal areas.