“Seven people working the night shift died on the spot,” governor of the Tambov region Evgeniy Pervyshov wrote on Telegram, adding that 28 drones were also shot down on approach.

He said 25 people had been injured, including seven in serious condition. Most of these injuries were caused by shrapnel wounds, he said.

It was the “largest and most inhumane” attack on Tambov region in terms of the number of drones used and the number of casualties, he said.

Meanwhile, governor of the Moscow region Andrei Vorobyov said eight of those injured in the strikes on the Wildberries warehouse in Elektrostal were in “serious condition”.

He added that total of 48 drones were shot down in the Moscow region overnight, and that a Russian oil depot had also been struck by a falling drone, which he described as the incident with “the most serious consequences”.

“Firefighters, emergency services, and the Ministry of Emergency Situations continue to work at the scene,” he wrote on Telegram. He did not describe the level of damage in detail. Zelensky separately confirmed Ukraine had struck “an oil facility”.

Ukraine has recently intensified its long-range drone attacks on Russia’s critical energy infrastructure, causing widespread fuel shortages. Earlier this month, Kyiv said nearly 43% of Russia’s oil refining capacity had been “disabled” as a result.

The BBC has not independently verified this figure.

Ukraine says Russian oil and gas facilities are legitimate targets as Moscow relies heavily on fossil fuel exports to finance its full-scale invasion, which began in February 2022.

Russian President Vladimir Putin made a rare admission last month that fuel shortages had been caused by Ukrainian attacks, and signed into law a bill aimed at boosting supplies to the domestic fuel market in early July.