An apparent drone strike started a fire at a fuel storage facility in the Crimean port city of Sevastopol on Saturday, the Moscow-installed governor there said.
The fire was still burning but it had been contained and no one was injured, Mikhail Razvozhaev said.
"The four fuel tanks that were hit, they are practically burnt out already," he said in a video posted on his Telegram channel.
Sevastopol, on the Crimean peninsula that Russia annexed from Ukraine in 2014, has come under repeated air attacks since Russia invaded the country as a whole in February 2022.
Russian officials have blamed the attacks on Ukraine.
A Ukrainian military intelligence official said more than 10 tanks of oil products with capacity of around 40,000 tonnes were destroyed, RBC Ukraine reported.
The official, Andriy Yusov, did not claim Ukraine was responsible for the explosion.
Prime Minister Keir Starmer said on Monday he would resign, with a new leader to be in place by the time parliament returns in September, paving the way for Britain to have its seventh leader in 10 years.
Three people died in France from health issues caused by extreme heat and almost 2,700 French schools were set to close or modify timetables as authorities across Europe issued heatwave warnings for Monday.
At least three students were killed and seven others injured when two students, aged 15 and 14, opened fire at a school in the city of Tacloban, southeast of Manila, police said.
Moscow shot down dozens of drones in the early hours of Monday, just days after a repeated Ukrainian strike on the city's oil refinery, while Russian attacks in Ukraine killed at least six people.