Platform profile · India · Long-range surface-to-air missile system · Indian Air Force; Russian Aerospace Forces (origin operator); also fielded by China, Türkiye and Belarus
Four of five contracted squadrons delivered (fourth in June 2026); a single-source report of 12 July 2026 puts the fifth and final squadron's arrival in November 2026, pending official confirmation, while a Rs 10,000 crore order for 288 replenishment missiles works through the acquisition cycle.
The S-400 Triumf is a Russian road-mobile long-range air defence system, developed by Almaz-Antey, that pairs a 600 km-class surveillance radar with a four-tier interceptor mix able to engage aircraft, drones, cruise missiles and ballistic missiles out to 400 km. India signed a US$5.43 billion deal for five squadrons in October 2018 and the system anchored its air defences in the May 2025 clashes with Pakistan, including a claimed ~300 km kill on a Pakistani AEW&C aircraft — the longest surface-to-air kill ever asserted. The fourth squadron arrived in June 2026 after Ukraine-war delays, the fifth is due by 2027, and a Rs 10,000 crore interceptor-replenishment order is moving through approvals.
Updated 12 Jul 2026
Verified figures
Spec sources: army-technology.com ↗ · missilethreat.csis.org ↗ · tribuneindia.com ↗
Changelog
A single-source report says the fifth and final S-400 squadron is slated to arrive in India in November 2026, which would complete deliveries under the US$5.43 billion five-squadron contract signed in October 2018; neither government has confirmed the date.
India's Defence Acquisition Council clears capital proposals worth about Rs 52,000 crore with a pronounced air-defence tilt — MRSAM, VSHORADS and the Akash Tarang counter-UAV system among them — stacking fresh interceptor layers beneath the S-400 umbrella in the post-Sindoor architecture.
Israel's Rafael is reported in talks with multiple Indian private firms to manufacture Iron Dome's Tamir interceptors in India — the high-volume short-range tier of the layered air-defence network that the S-400 tops at long range.
The fourth S-400 squadron arrives in India after years of Ukraine-war delivery delays, with deployment expected to seal gaps in western-sector coverage; the fifth and final squadron under the 2018 contract is expected by late 2026 or 2027.
The Defence Acquisition Council grants Acceptance of Necessity for 288 S-400 missiles from Russia — 120 short-range and 168 long-range interceptors worth about Rs 10,000 crore (~$1.1 billion) — to replenish stocks expended during the May 2025 conflict with Pakistan.
Air Chief Marshal A.P. Singh says S-400 fire downed five Pakistani fighters and an AEW&C/ELINT aircraft at about 300 km during Operation Sindoor — claimed as the longest surface-to-air kill in history; Pakistan rejects the claim, which lacks independent verification.
First combat use in Indian service: S-400 'Sudarshan Chakra' batteries engage the Pakistani drone-and-missile barrage launched overnight on 7–8 May against military installations from Srinagar and Amritsar to Phalodi and Bhuj during Operation Sindoor.
The Indian Air Force begins deploying its first S-400 squadron in the Punjab sector, positioned to cover aerial threats from both Pakistan and China as initial deliveries under the 2018 contract conclude.
India and Russia sign the US$5.43 billion government-to-government contract for five S-400 squadrons during the annual bilateral summit in New Delhi, going ahead despite the threat of US CAATSA sanctions.
3 tagged stories
A single-source report says the fifth and last S-400 squadron will reach India in November 2026, completing the $5.43 billion contract signed with Russia in October 2018 after years of Ukraine-war delays. Official corroboration is awaited.
India's Defence Acquisition Council granted Acceptance of Necessity for proposals worth about Rs 52,000 crore on 3 July, a tri-service package weighted toward counter-drone weapons and layered air defence.
Israel's Rafael is negotiating with multiple Indian private-sector defence firms to manufacture the Iron Dome's Tamir interceptor in India, with output earmarked for Israeli domestic demand and export orders.
