'50,000 Russian troops pinned down' — Ukraine halts advance in Sumy Oblast, summer offensive 'faltering,' Syrskyi says
Ukraine has halted Russia's advance in Sumy Oblast, stabilizing the front line and blunting the momentum of Moscow's summer offensive, Commander-in-Chief Oleksandr Syrskyi said on June 26.
"Based on the results of May and June, we can say that this year's wave of the enemy's summer offensive from Russian territory is faltering," Syrskyi said, reporting that Russian troops in the northeastern border region had been stopped.
Moscow launched its new summer campaign in May, aiming to push deeper into Ukraine's northeast and eastern regions, disregarding Kyiv's calls for an unconditional ceasefire.
Russian forces had made modest gains, occupying around 449 square kilometers (173 square miles) in May, the highest monthly total in 2025, according to the open-source intelligence group DeepState.
In Sumy Oblast, however, the line of contact has stabilized. Syrskyi said Ukrainian troops are not only defending but also reclaiming ground using active defense tactics.
"In certain areas, our units are liberating Ukrainian territory," he said.
Syrskyi said Ukrainian operations in Russia's Glushkovsky district had forced Moscow to shift elite units, including Airborne Forces and Marine Corps brigades, into defensive positions, undermining their offensive capabilities in Sumy.
"In the North Slobozhansky and Kursk directions, we have once again pinned down about 50,000 Russian Armed Forces personnel," Syrskyi said. He provided no further details about how Ukraine had achieved this.
Ukraine launched a cross-border offensive into Russia's Kursk Oblast in August 2024, initially capturing 1,300 square kilometers before losing most of that territory in a Russian counterattack earlier this year.
Russian officials declared complete control over the region on April 26, though the claim was later disputed by Kyiv and contradicted by Russia's own local authorities.
Russia's broader offensive aims to seize the remaining administrative borders of Donetsk and Luhansk oblasts and carve out a buffer zone along the Sumy and Kharkiv frontiers.
Sumy Oblast, which borders Russia to the east, remains a strategic region. Since the beginning of the full-scale invasion, it has faced near-daily attacks.
