In June, Russia Took 16X Less Ground For 19X More Casualties Than 2025

Russia's spring-summer offensive is now being called a failure. It has failed 'to produce operationally significant gains,' has cost nineteen times more in casualties than its similar effort last year and has been deemed unlikely to achieve a breakthrough into Ukraine's Fortress Belt which was its stated goal. 

The implication is that despite amassing as large a force as it can, and deploying that force against Ukraine's defenses, it has been unable to achieve any sort of meaningful gain. In other words, the Russian military cannot win given its current leadership, weaponry, strategy, tactics and logistics. That is a worrisome sign for the Kremlin. JL

Maria Tril reports:

Russian forces' spring-summer 2026 offensive — Moscow's declared main effort of the year — has failed to produce operationally significant gains. Russia's rate of advance has been falling steadily since November 2025 and has not recovered. In June, the Russians suffered a sixteenfold collapse in the rate of advance. And the price Russia is paying for those shrunken gains has risen. Russian forces suffered 39,490 casualties in June 2026, or roughly 1,298 per square kilometer seized. In June 2025, they suffered 68 casualties per kilometer. They are now paying nineteen times more blood for every meter they take.  Russian forces are unlikely to achieve a breakthrough into the wider Fortress Belt that was Moscow's stated goal for the offensive. It remains out of operational reach.

Russian forces seized just 30 square kilometers across all of Ukraine in June 2026 — compared to 481 in June 2025, the Institute for the Study of War assessed on 1 July, publishing its monthly battlefield summary.

That is a sixteenfold collapse in the rate of advance. And the price Russia is paying for those shrunken gains has not fallen with them — it has risen. Russian forces suffered 39,490 casualties in June 2026, or roughly 1,298 per square kilometer seized. In June 2025, they suffered 68 casualties per kilometer. They are now paying nineteen times more blood for every meter they take.

The spring-summer 2026 offensive — Moscow's declared main effort of the year — has failed to produce operationally significant gains, ISW concluded. Russia's rate of advance has been falling steadily since November 2025 and has not recovered.

Kostiantynivka: Russia's "main effort" stuck in urban grinding

The bulk of what Russia has managed to take this year lies inside Kostiantynivka in Donetsk Oblast, the southern anchor of Ukraine's Fortress Belt. Russian forces infiltrate or control roughly 37 percent of the city and accounted for 77 percent of all June gains across the entire front. They first entered the city in October 2025 after seizing Chasiv Yar and Toretsk at the cost of roughly 26,000 casualties for Toretsk alone. Progress since has been measured in city blocks.

ISW assesses that Russian forces are unlikely to achieve a rapid operational breakthrough into the wider Fortress Belt. The Fortress Belt — a chain of fortified cities anchoring Donetsk's defense — was Moscow's stated goal for the offensive. It remains out of operational reach.

Russia has massed heavily for the push: at least one combined arms army, one army corps, and elements of at least four additional armies and naval infantry formations are operating in the Kostiantynivka area. The concentration of forces underscores how seriously the Kremlin has prioritized the objective. It also underscores how poorly that concentration has performed.

Ukrainian strikes are compounding Russia's retreat from speed

Behind the front, Ukraine's strike campaigns are doing measurable damage to the machinery that sustains Russian advances. Ukrainian forces conducted at least 303 intermediate-range strikes against targets in occupied Ukraine in June 2026, up from 210 in May.

The toll on Russian logistics has been significant. Russian forces lost 12,867 fuel vehicles and fuel tanks in June 2026 — nearly four times the 3,395 lost in June 2025. Drone losses tell a more dramatic story: 60,849 Russian drones of various types destroyed in June 2026, against 4,581 in June 2025 — a 13-fold increase. Artillery system losses rose more modestly, from 1,243 to 2,053.

ISW attributes the slowing advance in part to this campaign: Ukraine's intermediate-range strikes are increasingly disrupting Russian logistics across occupied territory, particularly in the south and into Crimea, in ways now visible on the front line.

Ukraine has also expanded long-range strikes into Russia proper. In June, Ukrainian forces hit oil infrastructure and military targets across at least 41 Russian federal subjects. Moscow and Chelyabinsk — previously well beyond reach — have now been struck. The strikes are contributing to fuel shortages across Russia, ISW assessed, and Russia has largely failed to adapt its air defenses to counter them.

Can Russia sustain this?

ISW flagged a question the numbers raise directly: Russia is struggling to replace losses under its current recruitment methods, and it remains unclear how long it can maintain its current offensive tempo at its current loss rate.

The offensive is not over. Russian forces will likely continue grinding through Kostiantynivka in the coming months, ISW assessed. But what began as a spring-summer push to crack Ukraine's Fortress Belt has, through June, produced one city in slow attrition — and a casualty rate that makes every meter more expensive than the last