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The Russian military averaged nearly 184 assaults per day in May, a 19% increase over April, the Ukrainian open-source intelligence group Deep State reported.

According to BBC Russian Service military analyst Pavel Aksyonov, Russia is concentrating forces to strike at weak points in Ukraine’s defenses and break through.

“The Russian army aims to exhaust Ukrainian forces and prevent them from sending reinforcements to critical areas. But capturing the city of Sumy is unlikely. They don’t have enough strength,” Aksyonov told The Moscow Times.

Stupak noted that Ukraine’s military is more vulnerable following prolonged fighting in Russia’s Kursk region, which it withdrew from earlier this year after launching a bold cross-border incursion last summer.

“During the Kursk operation, we took heavy losses of both manpower and equipment. We redeployed many units there, including from the Donetsk region. Now the front in Donetsk is sagging, and Russia is taking advantage. They are now trying to encircle Pokrovsk and Kostiantynivka and are transferring additional forces there,” Stupak said, noting that the front is holding for now.

Despite these advances, Western and Ukrainian analysts caution that Russia’s gains may not be sustainable. The Kremlin is reportedly grappling with significant equipment losses and growing logistical strain.

A Pentagon intelligence report cited by The Washington Post estimated that Russia has lost over 10,000 military vehicles, 3,000 tanks and some 250 aircraft since the war began.

The Soviet-era stockpiles of armored vehicles are nearly exhausted, and current tank production, around 200 per year, is unlikely to replenish those losses anytime soon.

There are also signs of strain on the battlefield.

Russian soldiers are increasingly attacking in civilian vehicles, including, as one video circulating on Russian Telegram channels shows, a Porsche Cayenne SUV. These vehicles are often destroyed by Ukrainian drones.

Despite its heavy troop casualties, Russia has managed to sustain its manpower through aggressive recruitment campaigns and by shifting its tactics.

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“They’re concentrating forces, deploying drones en masse and targeting Ukrainian logistics before pushing forward,” said Aksyonov.

Still, he said, Russia is unlikely to achieve a breakthrough that could decisively turn the tide of the war with its current resources.

According to current estimates, it would take Russia up to three years at its current pace to capture all of Donetsk alone. Taking the remaining regions, analysts say, would require far greater time, resources and bloodshed.

For the Kremlin, however, ideological and political factors outweigh military logic.

“Russia may be low on resources, but that doesn’t change their will to wage war,” said Pavel Luzin, a Russian military expert. “For the Russian government, it’s a matter of survival and legitimacy. Russia desperately needs a pause in the fighting, but it can’t politically afford one. Ukraine isn’t asking for peace at any cost.”

Luzin said Russia is hoping that time and fatigue will work in its favor. If Western military and financial support for Ukraine collapses, or if domestic pressure mounts on Ukrainian President Volodymyr Zelensky to seek peace, Russia could gain the upper hand at the negotiating table.

But while U.S. military aid has indeed slowed, European nations have continued to back Kyiv. And Ukraine is ramping up its own defense industry, increasingly producing weapons domestically, Aksyonov said.

“All these massive attacks on civilians keep happening because the Kremlin is likely waiting for Ukrainians to tire of the war and pressure Zelensky to accept peace at any cost. But that hasn’t happened,” said Stupak.