Ukrainian drone attacks on two buses taking people to work killed six people and injured another 35 in the Belgorod region of Russia, the governor said on Monday.
Governor Vyacheslav Gladkov said the attack took place near the village of Berezovka. He published a picture of a bus with its windows blown out.
Gladkov said one man was in serious condition and two children had superficial injuries.
Belgorod region which borders Ukraine has been repeatedly attacked by Ukrainian artillery, drones and proxies over the past year. Russia invaded Ukraine in 2022.
Meanwhile, a Russian overnight drone attack cut power to over 400,000 consumers in Ukraine's northeast region of Sumy, Ukraine's energy ministry said in a statement via the Telegram messaging app.
Work to restore power continued into the morning as 91 settlements remained without power in the region. Ukraine downed 12 out of 13 drones used by Russia in the attack.