https://www.armyrecognition.com/archives/archives-naval-defense/naval-defense-2016/two-russian-project-21631-buyan-m-class-corvettes-deploy-to-mediterranean-sea
Two Russian Project 21631 Buyan-M Class Corvettes Deploy to Mediterranean Sea
russian projecttwobuyanclasscorvettes
https://www.thejakartapost.com/news/2009/02/07/development-lake-buyan-goes-without-permits.html
Development at Lake Buyan goes on without permits - Sat, February 7, 2009 - The Jakarta Post
developmentlakebuyangoeswithout
https://www.naval-technology.com/projects/buyan-class-corvettes-project-21630-russia/
Dec 1, 2021 - Project 21630 Buyan Class corvettes are in service with the Russian Navy. Three Buyan Class corvettes were built by JSC…
naval technologybuyanclasscorvettesproject