Jens Asbjørn Bøgen
More than four years into Russia’s war in Ukraine, Moscow continues to suffer casualties by the tens of thousands every month.
Russia’s offensive has run on a steady flow of fresh troops. Ukraine has long argued that if monthly losses outpace what the Kremlin can quietly replace, Moscow’s war becomes politically untenable.
September’s numbers put that argument on firmer ground than at any point in 2026.
Citing a senior NATO military official, Bloomberg reported on October 11 that Russia suffered more than 50,000 personnel losses in September, with upwards of 28,000 of those killed in action.
Ukrainian forces, by the same NATO estimate, lost about 5,000 troops over the same period, as carried by Ukrainian news agency UNN.
The NATO official described September as the war’s deadliest single month for the Russian military. The alliance’s figures have not been independently verified, and Moscow does not publish comprehensive casualty data.
A record confirmed by Ukraine’s own count
Ukraine’s General Staff put the September figure lower, at 46,230 personnel, but still called it an absolute record for 2026.
Its October 1 breakdown showed Russian losses climbing through the year: 31,710 in January, 39,290 in June, 42,860 in July, 42,020 in August, and the September peak.
Compared with January, enemy losses in September had grown by 14,520, an increase of 45.8%.
The month also produced one of the sharpest single-day spikes of the war. Ukraine recorded 2,090 Russian casualties on September 28 alone, the highest 24-hour figure since the full-scale invasion began in February 2022, with British Defence Intelligence tying the toll to intense fighting around the fortified belt of Donetsk cities near Dobropillia.
Closing in on Kyiv’s war-breaking threshold
The September numbers edge within range of a target Ukraine’s leadership publicly set earlier this year.
In January, then-Defense Minister Mykhailo Fedorov told reporters that one of Ukraine’s strategic objectives was to inflict roughly 50,000 Russian casualties a month, arguing such losses would make the war unsustainable for the Kremlin.
“Last month, 35,000 were killed, all of these losses have been verified on video. If we reach the figure of 50,000, we will see what happens to the enemy,” Fedorov said, as reported by Ukrainska Pravda.
Fedorov was dismissed in a government reshuffle in July.
The NATO official told Bloomberg that Russian commanders have continued pushing troops into Ukrainian “kill zones” saturated with armed drones, land mines and artillery, driving losses higher even as frontline gains have slowed.
