Approval will come from the Cabinet Committee on Security after costs are finalised and finance ministry approval is secured.
India Moves Ahead on Additional S-400 Air Defence Systems
India’s plan to acquire five more S-400 Triumf air defence systems from Russia appears to be moving forward, with Moscow sending New Delhi a Bill of Quantities (BOQ) proposal detailing construction and material costs.
The submission means that price negotiations between India and Russia can now begin. The final cost will be an important factor before the deal moves to the next stage.
India had originally signed a contract with Russia in 2018 for five S-400 systems at a cost of around $5.43 billion. The final system from that agreement is expected to arrive in India in November this year.
The S-400 has become a significant part of India’s air defence network, particularly because of the growing security challenge along the country’s borders.
No final decision on Su-57 yetWhile discussions around India-Russia defence cooperation continue, there is currently no final decision to purchase two squadrons of Russia’s fifth-generation Su-57 fighter aircraft.
The Indian Air Force has, however, shown interest in Russia’s proposal. One of the factors behind that interest is China’s growing deployment of its J-20 fifth-generation fighter aircraft.
Chinese J-20s have reportedly been positioned at airbases including Hotan, Lhasa and Nyingchi in Tibet, under the People’s Liberation Army’s Western Theatre Command.
For India, developments in the region have increased the importance of maintaining a strong air defence and fighter aircraft capability along the eastern frontier.
More S-400 systems could strengthen eastern sectorAccording to sources, the final decision on acquiring five additional S-400 squadrons will be taken by the Cabinet Committee on Security after the cost is settled with Moscow and approval is received from the Finance Ministry.
The fifth additional S-400 system is expected to be deployed in India’s eastern sector, where the military continues to closely monitor developments across the border with China.
The S-400 is designed to detect and engage aircraft, missiles and other aerial threats from considerable distances. Its ability to operate against multiple types of targets makes it an important component of India’s layered air defence network.
S-400’s reported performance during Operation SindoorThe system also gained considerable attention during Operation Sindoor in May 2025.
According to the claims cited in the report, an S-400 long-range missile engaged a Pakistani airborne early warning aircraft at a distance of around 314 kilometres across the Indus.
Pakistan reportedly used kamikaze drones in attempts to target S-400 systems deployed at Adampur and Bhuj air bases. The air defence system, however, remained operational and helped prevent Pakistani fighter aircraft from approaching the Indian border without facing significant risk.
The broader confrontation also saw Indian strikes on Pakistani military infrastructure. The report said 11 Pakistani air bases were hit by Indian BrahMos missiles, while several Pakistani aircraft were reportedly destroyed by Indian S-400 and Akash-Tir systems.
These battlefield claims remain part of the competing accounts surrounding the 2025 conflict, but the episode highlighted the strategic importance India places on long-range air defence.
Russia ties remain importantThe next major development could come during Russian President Vladimir Putin’s expected visit to New Delhi for the BRICS summit from September 11 to 13.
Beyond the S-400 and fighter aircraft discussions, India and Russia are also expected to continue cooperation in advanced defence technologies, including hypersonic missile systems.
For New Delhi, the broader objective is clear: strengthen air defence capabilities while maintaining strategic flexibility as security challenges increase along both the western and eastern fronts.
India is moving ahead with plans for five additional S-400 systems .
Russia has sent India a Bill of Quantities (BOQ) proposal.
Cost negotiations between the two countries are expected to follow.
India’s existing five-system S-400 contract was signed in 2018 for $5.43 billion .
The final system from that contract is expected in November 2026 .
There is no final decision yet on buying Russia’s Su-57 fighters.
India is closely watching China’s deployment of J-20 fifth-generation fighters .
The additional S-400 systems could strengthen India’s eastern air defence .
The Cabinet Committee on Security will take the final decision after cost and financial approvals.
India and Russia are also expected to deepen cooperation in advanced defence and hypersonic missile technology .