The 52-year-old was on his way back to the frontlines and is believed to have died instantly along with another officer.

Competing claims have emerged over a deadly attack on a boarding school in Sudzha, a city in Russia's Kursk region under Ukrainian control.

Videos from the Ukrainian unit tasked with interacting with the Russians in Kursk give a unique window into the 6-month-old occupation.

The Ukrainian army said four people were killed and dozens - many of them elderly - were injured in the town of Sudzha in the Kursk region, which has been under Ukrainian control for five months. More than 80 people are reported to have been rescued from the building.

Ukrainian forces on Sunday launched a new offensive inside Russia's western Kursk border region, going on the attack with substantial forces.

Kyiv and Moscow traded blame on Sunday for a strike on a school in a Ukrainian-occupied town in Russia's Kursk region, while Kyiv said new missile and drone attacks killed at least 18 people in Ukraine.