(Reuters) -One person was killed, two power substations and an oil depot caught fire after Ukraine launched "tens" of drones in a series of "massive" attacks launched across several Russian regions, Russian officials said on Tuesday.
A man died, two other people were injured and several residential houses were damaged overnight in the Belgorod region, Vyacheslav Gladkov, the governor of the region that borders Ukraine, said on the Telegram messaging app.
He said that over the past day four people have died and 20 were injured in various Ukraine's attacks.
A fire broke out at a power substation in the Rostov region after Ukraine launched "tens" of drones overnight, Vasily Golubev, governor of the southern Russia region that also borders Ukraine, said. The fire was extinguished, Golubev said on Telegram.
A series of explosions were heard in the town of Kalach-on-the-Don in the Volgograd region in Russia's south, the Baza Telegram channel, which has sources in Russian law enforcement, reported.
Andrei Bocharov, the governor of the Volgograd region, said in a Telegram post that a power substation and an oil depot caught fire from falling debris from drones which Russian air defence systems destroyed.
The fire at the substation was promptly extinguished, but firefighters were still trying to put out the fire at the oil depot, Bocharov said.
"There is no threat to residential buildings," he added.
A "massive" Ukraine drone attack was also repelled in the southern Russian Astrakhan region, the region's governor said, adding there were no injuries.
Several Ukraine-launched drones were also destroyed over the Voronezh region, several hundred kilometres (miles) south of Moscow and over the Kursk region, in Russia's southwest that borders Ukraine, governor said. There was no information on potential damage.
Russian officials often do not disclose the full extent of damage inflicted by Ukrainian attacks.
Reuters could not independently verify the Russian reports. There was no immediate comment from Ukraine.
The attacks come after Russia blasted the main children's hospital in Kyiv with a missile in broad daylight on Monday and rained missiles down across Ukraine, killing at least 41 civilians in the deadliest wave of air strikes for months.
Ukraine's President Volodymyr Zelenskiy vowed on Monday that Kyiv will retaliate.
(Reporting by Lidia Kelly in Melbourne; Editing by Christian Schmolinger and Michael Perry)
