Ukraine said it hit a drone command unit in the Kursk region, amid reports of fresh attempts to cross into Russia, BBC reported.

Sunday's attack on the unit was located near the Russian village of Tyotkino, according to the Ukrainian general staff.

Russian officials also reported an electrical substation in the town of Rylsk had lost power after being damaged in an attack by Ukraine. 

The reports come after Moscow claimed in April to have regained control of the entire region, nine months after a Ukrainian forces launched a surprise invasion. Kyiv insists it still has soldiers operating across the border, according to BBC.