Ukrainian drones attacked targets in Tatarstan, a highly industrialized region south-east of Moscow. In the early hours, some people were injured, said Tatarstan’s head, Röstäm Miñnexanof.

Russian electronic warfare defenses intercepted a Ukrainian drone near Tatneft’s Taneco refinery, one of Russia’s biggest, in Nizhnekamsk, the RIA state news agency reported.

A fire broke out at the refinery and was extinguished within 20 minutes, but production has not been disrupted, RIA said.

Pictures from the scene indicated the drone hit the primary refining unit, CDU-7, at the Taneco refinery.

It was one of Ukraine’s deepest drone attacks on Russian territory.

The Taneco oil refinery is one of Russia’s largest and newest. Its production capacity stands at around 360,000 barrels per day.

Tatarstan’s Miñnexanof said that enterprises in Yelabuga and Nizhnekamsk were attacked.

Two drones attacked a dormitory on the territory of the Alabuga Special Economic Zone. At least seven people were injured, Russian media reported.

“There is no serious damage; the technological process of the enterprises is not disrupted,” Miñnexanof said.

The Washington Post reported last year that Russia was mass-producing drones at a plant in the Alabuga Special Economic Zone.

A Ukrainian intelligence source told Reuters in Kyiv that “significant damage” had been done to a military target in Russia’s Tatarstan region in an attack using Ukrainian-made drones.