Russian forces are attempting to create an active fighting zone in Ukraine's northeastern region of Sumy, across the border from Russia's Kursk region, Ukraine's border guard spokesman said on Monday.

"These are small assault units, composed of a few people. They try to penetrate our territory, accumulate forces and advance further into Ukraine, probably to cut off logistical routes," State Border Guard spokesperson Andrii Demchenko said on national television.

Sumy is located across the border from Russia’s Kursk region, where Ukrainian troops launched an offensive in August. Russian forces occupied parts of Sumy during the early part of their full-scale invasion of Ukraine that began more than three years ago.

"Currently, Russian forces are attempting to storm the border in infantry groups without vehicle columns," Andrii Kovalenko said on Telegram. "There has been no breakthrough at the moment; the fighting continues.

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Russia on Sunday announced it had captured territory in Ukraine's Sumy region for the first time since 2022 in a cross-border offensive, as Kyiv struggles to hold onto territory in Russia's neighbouring Kursk region.