The S-400 Triumph (NATO reporting name: SA-21 Growler), formerly known as the S-300PMU-3, is an advanced anti-aircraft weapon system developed by Russia’s Almaz Central Design Bureau in the 1990s as an upgrade of the S-300 family.

• The system is designed for long-range air defense, capable of tracking and engaging multiple aerial targets simultaneously.

• In 2017, The Economist described the S-400 as “one of the best air-defense systems currently made”, highlighting its technological sophistication and effectiveness.

• It represents a significant advancement in modern military defense capabilities and is considered a key asset in Russia’s air defense strategy.