What is “S-400”, sometimes seen in the

Solution

The S-400 Triumf is a mobile, surface-to-air missile system (SAM) designed by Russia. It is the most dangerous operationally deployed modern long-range SAM (MLR SAM) in the world. The system can engage all types of aerial targets including aircraft, unmanned aerial vehicles (UAV) and ballistic and cruise missiles within a range of 400 km, at an altitude of up to 30 km. The system can track 100 airborne targets and engage six of them simultaneously.