NEW DELHI — June 03, 2026 : India has received the fourth squadron of the Russian-made S-400 Triumf air defence system, known in Indian Air Force (IAF) service as Sudarshan, marking another significant step in enhancing the country's long-range air defence capabilities. The system arrived in India by ship recently and is expected to be deployed in an operational sector soon.
The delivery is part of the $5.43 billion agreement signed between India and Russia in 2018 for the procurement of five S-400 squadrons. Three squadrons had already been inducted into service, while deliveries of the fourth and fifth units were delayed due to disruptions caused by the Russia-Ukraine conflict. Defence sources indicate that the fifth and final squadron under the contract is expected to arrive in the coming months.
The S-400 is one of the world's most advanced long-range surface-to-air missile systems, capable of engaging aircraft, drones, cruise missiles, and ballistic missile threats at ranges of up to 400 kilometres, depending on the missile variant. Equipped with advanced radar systems and multiple launchers, it provides layered air defence coverage and strengthens India's ability to detect and respond to aerial threats.
According to defence sources, the fourth squadron is likely to be deployed in the western sector, potentially covering areas in Rajasthan and Punjab, further enhancing air defence along the western frontier. The system integrates with India's existing air defence architecture and improves overall situational awareness and operational readiness.
The S-400 system played an important role during Operation Sindoor, where it supported India's air defence operations. Defence officials stated that the system was involved in a long-range engagement against a Pakistani surveillance aircraft, highlighting its capability to engage aerial targets at extended distances.
India is also pursuing the expansion of its air defence network. The Defence Acquisition Council (DAC) has cleared a proposal for the procurement of five additional S-400 squadrons, with discussions reportedly continuing with Russia.
Alongside these acquisitions, India is developing an indigenous long-range air defence system under Project Kusha, also known as the Extended Range Air Defence System (ERADS). Led by the Defence Research and Development Organisation (DRDO), the programme aims to develop a domestic system with engagement ranges of up to 400 kilometres against aircraft, drones, cruise missiles, and other aerial threats. Defence manufacturer Solar Industries is participating as a development and production partner.
Project Kusha is expected to enter service around 2028 and will form part of India's broader effort to establish a self-reliant and multi-layered air defence network. The combination of imported S-400 systems and indigenous programmes is expected to strengthen India's long-term air defence capabilities across multiple operational sectors.
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