The S-400 Triumf (Russian: C-400 Триумф - Triumf; translation: Triumph; NATO reporting name: SA-21 Growler), previously known as the S-300 PMU-3,[2] is a mobile, surface-to-air missile (SAM) system developed in the 1990s by Russia's Almaz Central Design Bureau for Marine Engineering as an upgrade to the S-300 family.