Russia has formally responded to India’s tender for five additional S-400 Triumf long-range air defence squadrons, marking a significant step forward in New Delhi’s plans to strengthen its layered air defence network. The Russian proposal has been received by the Defence Ministry and is currently being processed, according to defence sources. The proposed procurement is estimated to be worth more than ₹50,000 crore.
India had cleared plans to acquire five more S-400 systems in March 2026, following the system’s reported role during Operation Sindoor. The additional squadrons are expected to enhance India’s ability to counter a wide range of aerial threats and are likely to reinforce air defence coverage along both the western and eastern fronts.
The latest development builds on the existing S-400 programme between India and Russia. Under the original agreement signed in 2018, India contracted five S-400 squadrons. Four of those squadrons have already been delivered, while the fifth and final unit is expected to be delivered by November 2026, according to recent reporting.
The S-400 is designed to detect, track and engage multiple types of aerial threats, including aircraft, cruise missiles and other airborne targets. Its long-range engagement capability has made it a key component of India’s multi-layered air defence architecture. During Operation Sindoor, Indian military officials highlighted the system’s performance in countering hostile aerial threats. Western Air Command chief Air Marshal Jeetendra Mishra has also stated that an S-400 engagement during the operation reached a reported range of 314 kilometres.
The proposed five additional squadrons would further expand India’s inventory of the Russian air defence system at a time when the country is also pursuing indigenous alternatives. India is developing its own long-range air defence capability under Project Kusha, while other programmes are being pursued as part of broader efforts to build a comprehensive national air defence network.
According to the reports, deliveries of the additional S-400 systems could begin around three years after a formal agreement is signed. However, the Russian proposal is still under processing, meaning that final contractual approval, delivery schedules and other terms have yet to be determined.
The new proposal highlights the continuing defence relationship between India and Russia while underscoring India’s focus on expanding its air defence capabilities. If the proposed acquisition is approved, the additional S-400 squadrons would represent a major enhancement to the Indian Air Force’s long-range air defence network.