Ukrainian drones launched a night-time attack on Russia's western Kursk region, damaging a hospital and apartment buildings and injuring at least one person, the regional governor said early on Friday.
Across the border in Ukraine's Sumy region, the regional governor reported fresh fighting in villages near the border where Russia has been seizing territory. He said various areas in his region were constantly changing hands.
Russian President Vladimir Putin has said he wants to create a buffer zone in Sumy, which was used to help launch Ukraine's incursion into Kursk last year.