European Security — 2026-05-29

Russian Rate of Military Losses in Ukraine Almost Triples in One Year While Territory Remains Static

BLUFRussia's casualty-per-kilometer rate will likely hold above sustainable thresholds through summer, capping net territorial gains well below 2025 levels absent a major mobilization surge.

The ISW found Russia made a net territorial gain of 104 sq km between January 1 and May 26, down from 1,619 sq km over the same period in 2025 1. A May 18 DIA report to Congress confirmed Ukraine retook approximately 400 sq km in and around Dnipropetrovsk during the quarter, more territory than at any point since late 2022 1. Defense Minister Fedorov reported on May 16 that Russian casualties per square kilometer of advance reached 179 in April, compared to 67 in October 2025, with monthly peaks of 254 in March 12. President Zelenskyy stated on May 22 that Russian losses since January 1 total 145,000, including approximately 86,000 killed, at least 59,000 seriously wounded, and more than 800 taken prisoner 13.

Analysis
Russia's net territorial gain through August 25 will likely remain below 150 square kilometers, as the April cost of 179 casualties per square kilometer of advance signals a structural attrition deficit that Moscow's mobilization machine cannot close at current operational tempo. Moderate confidence reflects convergence across DIA reporting (the sole independent signal in the dataset, confirming Ukraine's 400-square-kilometer recapture in Dnipropetrovsk) and ISW territory metrics, tempered by casualty figures sourced entirely through Ukrainian government channels and unverifiable by open means. Those figures may instead reflect systematic inflation calibrated for international audience management rather than battlefield ground truth. If Russian gains exceed 150 square kilometers before August 25, Western governments face a decision on whether to shift aid composition toward direct territorial defense augmentation rather than sustaining the current attrition-first supply model.
4 sources
  1. Russian rate of losses in Ukraine almost triples in one year - Al Jazeera
  2. Ukraine Aims to Inflict 200 Russian Casualties for Every Sq Km of Advance, Fedorov Says - United24 Media
  3. 145,000 Losses, 86,000 Killed: Zelenskyy Details Russia's 2026 Battlefield Toll - United24 Media
  4. Russian Offensive Campaign Assessment, May 26, 2026 - ISW/Critical Threats

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