Project Kusha explained: Why India’s 'own S-400' is not designed to stop ballistic missiles

India has taken a major step toward developing its own advanced air defense system with the successful maiden test of the Kusha Surface-to-Air Missile (SAM). Conducted by the Defense Research and Development Organization (DRDO), the test marks a significant milestone in India’s efforts to build a domestic alternative to foreign systems such as Russia’s S-400, the U.S.-made Patriot, and China’s HQ-19. The Kusha project, part of a larger initiative known as Mission Sudarshan Chakra, aims to create a comprehensive and integrated air and ballistic missile defense network. The test of Kusha, which is being developed in three variants, M1, M2, and M3—was conducted after years of research and development. Each variant is designed to cover different ranges, with M1 having a range of 150 kilometers, M2 reaching up to 250 kilometers, and M3 extending to 350 kilometers. These capabilities position Kusha as a key component of India’s layered defense strategy, intended to counter a wide array of aerial threats including aircraft, stealth fighters, cruise missiles, and drones. The need for such a system became evident following recent global conflicts, particularly in West Asia and Ukraine, where advanced air defense networks were crucial in mitigating the impact of aerial attacks. In India, the ongoing tensions along its borders and the increasing sophistication of potential adversaries’ military capabilities have underscored the urgency of developing a robust air defense system. Prime Minister Narendra Modi highlighted this goal during his 2023 Independence Day speech, announcing the development of a domestic system called Sudarshan Chakra, aimed at protecting both strategic and civilian assets from aerial threats by 2035. India’s push for self-reliance in defense technology comes amid growing concerns over the reliability of imported systems. For instance, during recent conflicts involving Iran, the limitations of existing air defense systems such as the U.S.-supplied Patriot and THAAD were exposed. Despite substantial investments, these systems failed to prevent damage to critical infrastructure, highlighting the necessity of a more integrated and redundant defense architecture. Under the Kusha project, India seeks to build a scalable and integrated system that can be seamlessly incorporated into a broader national defense framework. Unlike the S-400, which is primarily focused on air defense, Kusha is designed to operate within a multi-layered system that includes radar networks, command centers, and a variety of defensive weapons. This approach mirrors concepts like the U.S.’s Golden Dome or Israel’s Iron Dome, though tailored to meet India’s unique geographical challenges. India faces distinct challenges compared to smaller nations like Israel, which defend a relatively compact territory. Protecting a vast landmass with numerous high-value targets spread over thousands of kilometers requires not only advanced interceptor missiles but also extensive sensor networks, radars, and command structures. Additionally, the integration of emerging technologies such as directed energy systems, including laser-based weapons, adds complexity to the task. Despite these challenges, India has made notable progress in developing the foundational elements of its ballistic missile defense (BMD) system. Earlier tests have validated the capability to intercept missiles in the 2,000-kilometer range, while more recent trials have focused on intercepting threats in the 5,000-kilometer range. These developments indicate that India is moving closer to achieving its vision of a comprehensive and integrated air and missile defense system. The success of the Kusha test underscores India’s commitment to reducing its dependence on foreign defense systems and enhancing its strategic autonomy. However, the road ahead involves integrating all components into a cohesive network capable of detecting, tracking, and neutralizing threats effectively. As the project progresses, collaboration between government agencies, private industry, and academic institutions will be essential to realize the full potential of Mission Sudarshan Chakra.