The S-400 Triumf ( – Triumf; translation: Triumph; NATO reporting name: SA-21 Growler), previously known as the S-300 PMU-3, is a mobile surface-to-air missile (SAM) system developed in the 1990s by Russia's NPO Almaz as an upgrade to the S-300 family of missiles. The S-400 was approved for service on 28 April 2007 and the first battalion of the systems assumed combat duty on 6 August 2007. Its longest-ranged interceptor missile, the 40N6, has a purported range of 400 km. The S-400 can be integrated with the shorter-ranged Pantsir missile system, and potentially airborne radars such as of the Beriev A-50U and Sukhoi Su-35S. - Source: Wikipedia
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