Executive Summary

Russia’s nuclear modernisation is advancing unevenly. Legacy strategic systems are fielding behind schedule while novel exotic systems remain years from credible operational status. As one example, President Putin in 2018 unveiled six “next-generation” strategic systems; nearly eight years on, Sarmat, Poseidon, and Burevestnik remain characterised by repeated test failures, unverified claims, and constrained industrial capacity. 

Meanwhile, the expiration of New START on 5 February 2026 ended the only remaining verification regime on US and Russian strategic arsenals, removing the last check on how Moscow exploits this gap. The treaty ceiling is no more and external visibility into Russian force posture has declined, precisely at the moment Russia’s declared warhead totals are rising.

This report assesses Russian nuclear modernisation against open-source, unclassified governmental, and technical evidence spanning ICBM, hypersonic, underwater, and cruise-missile programmes. 

Key Judgements

KJ-1. Russia’s declared ICBM modernisation timeline patterns indicate it will almost certainly continue to slip beyond Kremlin-announced dates.

1. The Sarmat program produced one confirmed successful full-range flight test (20 April 2022) across fourteen years of development, against two silo-destroying failures in 2024 and 2025. [source, source]
2. Strategic Missile Forces Commander Karakayev’s December 2025 claim that a Yars regiment at Tatishchevo entered combat duty preceded construction rather than followed it. February 2026 satellite imagery showed only five of the regiment’s silos under construction and years from completion. [source, source] 
3. Roscosmos set 2023 as the Sarmat in-service date. Putin has since reset this to end-2026 which is a three-year slip on a single platform. [source, source]

KJ-2. Poseidon and Burevestnik are unlikely to achieve operational status in the next 5 years, and will continue to function as instruments of signalling rather than deployable systems.

1. Putin’s 29 October 2025 announcement of a successful Poseidon reactor-activation test released no telemetry, imagery, or location data, and remains unconfirmed by any independent sensor in publicly available information. 
2. MIT researchers Hecla and Kemp calculated that Burevestnik flies at approximately Mach 0.75 and measures approximately 9.5 metres in length. These parameters are inconsistent with Russian claims of a fast, defence-evading weapon. [source] 
3. Russia’s dedicated Poseidon-carrier fleet consists of one submarine in service (Belgorod, since 2022) and one launched but not yet commissioned (Khabarovsk, launched November 2025, commissioning targeted for end-2026), setting a ceiling on any near-term patrol tempo. [source]

KJ-3. Russia will likely increase the number of warheads uploaded onto existing strategic delivery systems following the expiration of New START.

1. Admiral Correll’s March 2026 congressional testimony placed Russia’s deployed and non-deployed strategic warheads at approximately 2,600. This exceeded the Federation of American Scientists’ (FAS) deployed-strategic estimate of 1,796 for the same period by over 800. [source, source]
2. FAS’s May 2026 Nuclear Notebook estimates Russia’s stockpile at approximately 4,400 warheads, an increase on the prior year’s estimate. [source] 
3. The U.S. State Department’s own New START treaty documentation states that the Russian Federation has the capacity to deploy many more than 1,550 warheads on its modernized ICBMs and SLBMs, as well as heavy bombers, but is constrained from doing so by New START. This is a constraint that no longer exists as of 5 February 2026.  [source]

Statement on Analysis

We have moderate confidence for our analysis in KJ-1 and KJ-3. They rely on corroborated satellite imagery, congressional testimony, and cross-checked institutional reporting (from FAS, IISS, CRS). Confidence in KJ-2 is lower, given reliance on a single MIT technical paper and the absence of any independent sensor confirmation of Poseidon’s October 2025 test. All three judgments assume Russian official statements while informative are systematically biased and purposefully optimistic. We also assume that satellite-derived construction timelines reliably explain operational timelines. 

The principal blind spot is the loss of New START verification. Without inspections or data exchange, warhead and launcher counts now rest entirely on national technical means and inference, degrading precision going forward. Key events that could revise this analysis include a verified Sarmat regiment activation at Uzhur, any independently confirmed Poseidon or Burevestnik test, a Russian warhead upload exceeding 1,550 deployed strategic warheads, or resumption of any bilateral arms control dialogue.

Intelligence Cut-off Date: 14 July 2026