Officials say a Ukrainian drone has struck an industrial plant deep inside Russia, injuring several people and causing a fire.

Russia ramped up drone attacks on Ukraine dramatically in June, an AFP analysis published Tuesday showed, pressuring the war-torn country's stretched air defence systems and exhausted civilian population.

Multiple people were killed and several others wounded in a Ukrainian drone strike on an industrial facility in the city of Izhevsk, Russian authorities said early Tuesday. Igor Brechalov, head of the republic of Udmurtia where Izhevsk is located,