The S-400 Triumf, previously known as the S-300 PMU-3, is a mobile surface-to-air missile system developed in the 1990s by Russia's NPO Almaz as an upgrade to the S-300 family of missiles. From Wikipedia
Securing Moscow’s commitment on final S-400 batches at Qingdao underpins India’s broader drive to modernise its Sukhoi-30MKI fleet, explore S-500 acquisitions, fast-track Project Kusha development
