Leaked data reveals massive Russian military casualties.
Hacker groups Cyber Partisans and Silent Crow breached Russia's Federal State Statistics Service (Rosstat), stealing 23 terabytes of data. The breach included a dataset of 11 million death certificates containing details on the age, residence, and location of death of the deceased.
Analysis of the leaked records indicates that approximately 400,000 Russians have been killed in the war in Ukraine. The Russian government has claimed that no sensitive information was obtained during the hack.
Hacker groups Cyber Partisans and Silent Crow breached Russia's Federal State Statistics Service (Rosstat).
EuronewsEstimates of Russian deaths in the Ukraine war based on the data range between 393,000 and 450,000.
EuronewsApproximately 400,000 Russians are indicated to have been killed in the war in Ukraine.
BloombergThe Russian government claims no sensitive information was obtained during the hack.
The GuardianLeaked Rosstat data indicates over 400,000 Russian deaths in Ukraine, highlighting a staggering human toll and regional inequality in losses.
Hacker groups claim a breach of Rosstat data suggests Russian war deaths are between 393,000 and 450,000, figures that are currently being verified by independent journalists.
Hacked Rosstat records show that about 400,000 Russians have been killed in the war in Ukraine.
Leaked records from Russia's statistics agency suggest at least 400,000 Russian war deaths in Ukraine, a figure Moscow has not disclosed.
The gap between official silence and leaked death certificates
The breach of a state statistics agency has exposed a massive dataset of 11 million death certificates. This data provides a concrete basis for estimating that approximately 400,000 Russians have been killed in the war. The Russian government maintains that no sensitive information was stolen, creating a direct conflict between the leaked records and official claims.
Whether these figures represent the true toll depends on the authenticity of the data and the methodology used to filter combat deaths from natural causes. If the records are verified, the data suggests that the burden of loss is not evenly distributed, falling more heavily on poorer and remote regions.
State agencies often manage sensitive data through centralized systems that become single points of failure. When official transparency vanishes, leaked administrative records typically become the only available mirror for the public to see the actual cost of state policy.
Between casualty counts and the geopolitical clock
Coverage focuses on the scale of the loss, but the outlets diverge on how they treat the data. Bloomberg and The Guardian treat the leaked records as a primary source to establish a death toll of 400,000. Euronews takes a more cautious approach, highlighting that journalists from Meduza and Mediazona are still verifying the authenticity of the files to rule out falsification.
The Guardian provides a broader context by linking the leak to the timing of US-brokered peace talks in Abu Dhabi. This connects the internal Russian casualty count to the external pressure of diplomatic negotiations.
Most coverage correctly identifies the lack of official statistics as the reason this leak is significant. However, the reporting relies heavily on the hacker groups' initial analysis. The reader needs to know if independent forensic audits of the 23 terabytes of data have been completed before accepting the 400,000 figure as a settled fact.
Nov 10 · Rosstat acknowledges cyberattack
Rosstat acknowledged it was the target of a cyberattack, though the agency denied that any data was leaked. Hackers claim that war has become the fourth-most common cause of death in Russia. According to Business Insider, 356,056 combat-related deaths are listed as 'operations of war,' with annual deaths peaking at 182,264 in 2025. Business Insider reports that Donetsk accounts for 54.9% of deaths by location and the Volga region is the most affected region. Business Insider states these figures align with estimates from British defense officials and former NATO commander Gen. Chris Cavoli.
The focus has shifted from the general scale of the leak to the specific composition of the casualties. Business Insider provides a granular breakdown, noting that Donetsk accounts for over half of the deaths by location and the Volga region is the most affected area. This adds a spatial dimension to the initial analysis regarding the uneven burden of loss across Russian regions.
Business Insider attempts to resolve the question of data authenticity by noting that these figures align with estimates from British defense officials and a former NATO commander. This external validation moves the conversation beyond the hackers' claims and the Russian government's denials.
Rosstat's admission of a cyberattack, while still denying a data leak, creates a logical gap. The agency confirms the breach occurred but denies the result, while the leaked data provides specific, verifiable patterns of death. The reader should now watch for whether independent forensic audits can confirm the 23 terabytes of data are genuine administrative records rather than manipulated files.
Of the combat-related deaths, 356,056 are specifically listed as 'operations of war.'
Business InsiderThe Volga region is noted as the most affected region.
Business InsiderDonetsk accounts for 54.9% of deaths by location.
Business InsiderAnnual deaths peaked at 182,264 in 2025.
Business InsiderRosstat acknowledged being the target of a cyberattack while denying that any data was leaked.
Business InsiderThe reported figures align with estimates from British defense officials and former NATO commander Gen. Chris Cavoli.
Business InsiderThe hackers claim that war has become the fourth-most common cause of death in Russia.
Business InsiderNews Story
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