Missile defence systems are becoming critical for national security in the face of evolving regional threats and advanced weapon technologies. Explain the working principle of missile defence systems. Critically assess India's progress in developing indigenous missile defence capabilities.

Strategy - RAAN direction of missile, Coordinated given its missile, Lower tier warhead Mandana, Deploy target. Indigenous missile defence - Apasteer technology (Indian ballistic missile), PRITHVI air defence system (for exosphere and early atmosphere), S-400 autonomous man-pad manual system. S-400 has also been made with Russian collaboration.