Ukrainian "rocket fire" killed three people and wounded several in Russia's Belgorod region overnight into Wednesday, Governor Vyacheslav Gladkov reported.

A sports facility and two apartment buildings were hit by the strikes.

Gladkov visited the site on Wednesday morning and offered temporary accommodation to the affected residents.

Belgorod's governor acknowledge that damage was "extensive" and that there might be trapped people under the rubble.

Russia seriously damaged one of Ukraine’s thermal power plants in an overnight attack, authorities said Wednesday, as Moscow pursued its campaign to deny Ukrainians heat, light and running water as winter approaches.