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.

India's Progress in Developing Indigenous Missile Defence Capacity. (1) DRDO Funding: Has been increased with 'Defence' spending highest in Budget 2025-26. (2) Nuclear Plan: Russia's collaboration for FBRA (2nd stage) plant in Kelapattanam, TN. (3) Space Capabilities: Subrahmanya Isudu's space move will bring expertise to developing capabilities. (4) Geopolitics: Israel's help during Sirajul Laud and India's unified stand with Israel will lead to indigenous development with foreign contribution. (5) Diversification: Reducing dependency on one single country. With European Union going for ReArm plan and BT NATO spending, India's development can create immense economic benefits.