Ukraine’s Operation Vivaldi Reverses Russian Gains, Inflicting Record Losses
Ukraine’s Operation Vivaldi has reversed Russian territorial gains, resulting in a net loss of nearly 300 square kilometers for Moscow since March 2026. Russian forces suffered over 46,000 casualties in September, their highest monthly toll of the year, while Ukrainian forces advanced near Lyman and prepared new positions toward Slovyansk.
Key points
- Ukraine’s Operation Vivaldi liberated at least 147 square kilometers near Lyman, disrupting Russian plans to encircle the Fortress Belt from the east.
- Russian forces suffered 46,320 casualties in September 2026, the highest monthly loss rate of the year and the third consecutive month exceeding 40,000 casualties.
- ISW assessed that Russia lost a net 293.59 square kilometers of territory since March 2026, despite claiming significant advances.
- Russian forces struck Kyiv’s Southern Bridge with drones, potentially using shaped-charge warheads to damage reinforced infrastructure.
- Ukraine deployed its new FP-7 tactical ballistic missile for the first time, with a range of up to 250 kilometers.
Background
Recent months have seen a shift in the Ukraine-Russia conflict, with Ukraine conducting sustained counteroffensives. Operation Vivaldi, which began in earlier months, has been a key factor in reversing Russian momentum. Previous assessments indicated that Russian gains had slowed significantly since March 2026, setting the stage for the current net territorial losses.
How outlets are covering it
ISW and UNITED24 Media emphasize the significant territorial losses and high casualty rates for Russia, highlighting the success of Ukraine’s Operation Vivaldi. Kyiv Post contrasts ISW’s findings with President Putin’s claims of accelerating advances, noting a discrepancy between official Russian statements and independent assessments. Critical Threats provides background on the broader context of the conflict but does not offer new perspectives on the current developments.
Why it matters
The reversal of Russian territorial gains and the high casualty rates indicate a potential shift in the balance of power in the Ukraine-Russia conflict. Ukraine’s successful counteroffensives and new military capabilities, such as the FP-7 missile, could impact the trajectory of the war and future negotiations.
What to watch
Ukraine is expected to continue its counteroffensives, potentially expanding operations beyond the Lyman area. Russia may intensify its drone and missile strikes against Ukrainian infrastructure, while Ukraine works to integrate new defense systems and maintain operational security.
- Russian Offensive Campaign Assessment, October 1, 2026 Institute for the Study of War
- Russia’s Offensive Goes Backward as Ukraine Regains Nearly 300 Square Kilometers Since March UNITED24 Media
- Putin Claims Huge Advance as ISW Finds Russia Lost Ground in September Kyiv Post
- The Russia-Ukraine War Report Card, Sept. 30, 2026 russiamatters.org
- Russian Offensive Campaign Assessment, September 28, 2026 criticalthreats.org
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