The S-400 Triumf (Russian: C-400 «??????»; NATO reporting name: SA-21 Growler), previously known as S-300PMU-3, is a new generation anti-aircraft weapon system developed by Russia's Almaz Central Design Bureau as an upgrade of the S-300 family. It is currently in limited service with the Russian Armed Forces.
The S-400 uses three different missiles to cover its entire performance envelope. These are the extremely long range 40N6, long range 48N6 and medium range 9M96 missile. Each one has different capabilities.