The strike at a depot in the Kamensky district comes amid a fire at an oil storage facility in the city of Proletarsk.
A Ukrainian drone strike has set fire to an oil depot in the Rostov region in southern Russia, officials said.
On Wednesday, regional governor Vasily Golubev confirmed the overnight strike, saying on the Telegram messaging app that firefighters were extinguishing the blaze at the depot in Rostov's Kamensky district, with no casualties reported.
Russia's Defense Ministry earlier said air defense units destroyed four drones over the region overnight, without mentioning the attack on the oil depot.
Three tanks were on fire at the oil depot after two drones crashed in the area, according to the Telegram channel Baza, which is close to the Russian security services.
The Ukrainian attack marked its latest assault on Russian oil and gas facilities in retaliation for attacks on its energy infrastructure.
A large fire has been raging at an oil storage facility in the Rostov town of Proletarsk since August 18 following an earlier attack by a Ukrainian drone about 200 kilometers (125 miles) from the Ukrainian border.
Earlier this month, another fuel storage depot in the Kamensky district was attacked.
At the time, Ukrainian President Volodymyr Zelenskyy praised his forces for attacking oil facilities in Russia, saying the strikes would help bring about a “just end” to the conflict.
The Russian ministry also said eight attack drones were destroyed in the Voronezh region, which borders Ukraine, but gave no details.
Voronezh Governor Alexander Gusev said debris from a drone launched from Ukraine over the region caused a fire “near explosive objects” but there was no detonation.
Nuclear security
Meanwhile, Russia said on Wednesday it wanted the International Atomic Energy Agency (IAEA) to take a “more objective and clear” stance on nuclear safety.
Foreign Ministry spokeswoman Maria Zakharova said the UN nuclear watchdog must act “in favour of the facts,” state news agency RIA reported, “ensuring security and preventing the development of a scenario on the catastrophic path to which the Kiev regime is pushing everyone.”
IAEA chief Rafael Grossi on Tuesday visited the Kursk nuclear power plant outside the town of Kurchatov in the Kursk region, where Ukrainian forces crossed the border three weeks ago.
Ukraine has not responded to Russian accusations that it attacked the plant. Asked by a journalist to condemn the damage caused by the drones as a “nuclear provocation” by Ukraine, Grossi said “finger pointing” was something he should take “extremely seriously.”
Grossi concluded that the facility – the same model as the Chernobyl plant in Ukraine, which witnessed the world's worst civilian nuclear disaster in 1986 – was vulnerable to a serious accident because it lacks a protective dome that could shield it from missiles, drones and artillery.
Russia's National Guard said Wednesday its forces had defused unexploded ordnance supplied by the United States and fired by Ukraine that was shot down just 5 kilometers (3 miles) from the Kursk plant.
There was no immediate comment from Ukraine.
