Russia has floated a stopgap proposal to supply the Indian Navy with three upgraded Kilo-class diesel-electric submarines, aiming to bridge a widening submarine capability gap as ageing platforms retire faster than replacements can be inducted.
According to defence and naval-industry sources, the offer envisages the transfer of three refurbished Kilo-class boats for a package price reported to be under $1 billion. Each submarine would undergo a comprehensive mid-life refit, extending its operational life by around 20 years, and would be equipped to fire torpedo-launched Kalibr cruise missiles, providing a reported strike range of up to 1,500 kilometres.
The proposal comes at a critical juncture, with the Indian Navy facing mounting pressure from delayed indigenous inductions, slow procurement cycles and the impending retirement of older submarines—factors that could trigger a sharp capability dip by the early 2030s.
Acute submarine shortage driving interim solutions
India’s conventional submarine arm has been under sustained strain. Several legacy submarines are nearing the end of their service lives, while replacement programmes have progressed unevenly. The induction of Scorpene-class (Kalvari-class) submarines has improved fleet strength, but not at a pace sufficient to offset retirements. Meanwhile, the long-pending Project-75(I) programme for next-generation submarines with air-independent propulsion (AIP) remains stalled.
Naval planners have repeatedly warned that, without interim inductions or life-extension measures, the Navy risks losing critical capabilities in undersea surveillance, sea denial and deterrence operations, particularly in the increasingly contested Indian Ocean Region.
Details of the Russian proposal
The Kilo-class submarines, known in Russian service as Project 877 and the improved Project 636 variants, are among the quietest diesel-electric submarines of their generation and have been widely exported. India’s long experience with the platform is seen as a key factor behind Moscow’s outreach.
Under the reported proposal, each submarine would receive:
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Major hull and systems refit for a 20-year life extension
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Upgraded sonar, navigation and combat management systems
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Overhauled propulsion and power-generation systems, including new batteries
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Integration of Kalibr cruise missiles, launched from 533-mm torpedo tubes
The inclusion of Kalibr missiles would significantly enhance the boats’ strike and deterrence capability, allowing land-attack and anti-ship missions well beyond traditional torpedo ranges.
Upgraded Kilo-class submarine: Key specifications
While final specifications would depend on contract terms, upgraded Kilo-class submarines are typically assessed to feature:
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Type: Diesel-electric attack submarine
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Displacement: 2,300–3,000 tonnes (surfaced), 3,000–4,000 tonnes (submerged)
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Length: 72–74 metres
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Beam: ~9.9 metres
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Speed: 10–12 knots (surfaced), up to 20 knots (submerged)
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Endurance: Weeks-long patrol endurance, with several thousand nautical miles range
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Crew: 50–60 personnel
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Armament:
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Six 533-mm torpedo tubes
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Heavyweight torpedoes and naval mines
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Kalibr (Club) submarine-launched cruise missiles
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Sensors: Hull-mounted sonar, electronic support measures and modern fire-control systems
Strategic implications for the Indian Navy
Acceptance of the Russian offer would allow India to arrest the near-term decline in submarine numbers and maintain operational continuity while indigenous programmes mature. The addition of submarine-launched cruise missiles would also strengthen conventional deterrence and provide greater flexibility in maritime strike operations.
However, defence analysts caution that even upgraded Kilo-class boats remain conventionally powered, lacking the endurance of nuclear-powered submarines or newer AIP-equipped designs. As a result, they are best viewed as a short-to-medium-term solution, rather than a substitute for long-term fleet modernisation.
Decision still pending
There has been no official confirmation from the Ministry of Defence or the Indian Navy on whether the proposal is under active consideration. Any acceptance would require government-to-government negotiations, detailed cost-benefit analysis, and alignment with India’s broader goal of building an indigenous and technologically advanced submarine force.
For now, Russia’s offer underscores the urgency of India’s undersea challenge—and the difficult trade-offs New Delhi faces between immediate operational needs and its long-term naval modernisation strategy.
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