The facility is in the Perm region of Russia, located in the Ural mountains more than 1,500 kilometres (900 miles) from Ukraine, Russian media said, with some unconfirmed reports saying it was a pumping station and storage complex. Perm Gov. Dmitry Makhonin said only that a drone hit an unspecified industrial facility, sparking a fire.

Russian officials have not been forthcoming about Ukrainian claims that Kyiv is carrying out more long-range attacks and that its domestically developed drones are increasingly accurate.

Advanced drone technology has become a defining feature of the battle as Russia's bigger army presses its more than four-year invasion of its neighbour.

Ukraine's response has included a drive to develop new drones for attack and defence.

Ukrainian President Volodymyr Zelenskyy on Wednesday posted a video on the Telegram messaging app showing a large plume of black smoke rising into the sky in countryside near a built-up area.