Russia's defence ministry said its air defence units intercepted and destroyed 70 Ukrainian drones over Russian territory overnight on Monday, including 25 over the Volgograd region, 27 over the Rostov region and seven over the Astrakhan region.
"The air defence forces of the defence ministry repelled a massive attack by aircraft-type drones on the territory of the Volgograd region," Volgograd Governor Andrei Bocharov said.
Explosions have been reported near a refinery operated by Russian oil producer Lukoil. (AP PHOTO)
Falling drone debris sparked several fires at an oil refinery, he said, although he did not say which refinery was on fire.
Baza, a Russian news Telegram channel that is close to Russia's security services, said a series of explosions were heard in the area around a refinery operated by Russia's second-largest oil producer Lukoil.
That 300,000 barrel-per-day refinery is the largest in southern Russia.
In the neighbouring region of Astrakhan, Governor Igor Babushkin said Ukrainian drones tried to strike energy facilities and a fire had broken out, but gave no further details.
"Ukrainian armed forces attempted a drone attack on objects located in the region, including fuel and energy facilities," Babushkin said on Telegram.
"There were no casualties."
Ukrainian Lieutenant Andriy Kovalenko, who heads the Center for Countering Disinformation, part of the National Security and Defense Council, said the Astrakhan gas processing plant had been hit.
The plant, controlled by gas giant Gazprom, is capable of processing about 8340 metric tons of gas condensate per day.
Baza and other Russian Telegram channels said Ukraine attacked a gas processing plant near Astrakhan.
Kyiv has been trying to fight back against Moscow with drone and missile strikes deep inside Russia. (AP PHOTO)
Unverified videos on social media showed giant flames and black smoke leaping into the night sky above a processing plant as bystanders expressed shock at the size of the fire.
Reuters could not independently verify battlefield reports from either side.
Gazprom and Lukoil did not immediately respond to requests for comment on whether their facilities had been attacked.
Russia's aviation watchdog Rosaviatsia temporarily suspended flights from the Astrakhan and Volgograd airports, as well as from Kazan, Nizhnekamsk, Saratov and Ulyanovsk to ensure air safety.
Flights were later restored at most of the airports, Rosaviatsia said on Telegram.
Since Russia sent thousands of troops into Ukraine in 2022, Kyiv has tried to fight back against its much bigger neighbour by striking deep into Russia with drones and missiles, and even killing a senior military commander in Moscow.
Russia says the attacks amount to terrorism, are an escalation of the war and that the West aids the attacks with weapons and targeting information.
Ukrainian officials say they have a right to hit back at Russia, as Russia's energy, transport and military infrastructure is key to Moscow's war effort.
with DPA
