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

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

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

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

He added that a total of 48 drones were shot down overnight in the Moscow region and that a Russian oil depot was also hit by a drone crash, which he called 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 that Ukraine had attacked “an oil facility.”

Ukraine has recently stepped up its long-range drone attacks against Russia’s critical energy infrastructure, causing widespread fuel shortages. Earlier this month, kyiv said that nearly 43% of Russia’s oil refining capacity had been “unused” 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 large-scale invasion, which began in February 2022.

Russian President Vladimir Putin admitted last month that the fuel shortage had been caused by the Ukrainian attacks and signed a bill into law aimed at increasing supplies to the domestic fuel market in early July.