The Russian S-300 and S-400 Missile SystemsAn expert account of the development, role, and capabilities of the S 300 and S 400 air defence missile systems, key strategic weapons in Putin's Russia. Few modern missile systems have had such significance as the S 300 family. Highly regarded technically, Russias most powerful air defense systems have been a major strategic asset to the country, exported to major powers around the world, and are a key weapon in many international hotspots and in