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.