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.
US Defence Secretary Pete Hegseth said on Tuesday that the ceasefire with Iran was not over, even as the US and Iran exchanged fire in the Gulf as they wrestled for control of the Strait of Hormuz.
The US military said on Monday it destroyed six Iranian small boats and intercepted Iranian cruise missiles and drones as Tehran sought to thwart a new US naval effort to open shipping through the Strait of Hormuz.
A blast at a fireworks factory in China has killed at least 26 people and injured 61, flattening buildings and sending towering clouds of smoke into the sky, and prompting President Xi Jinping to order a thorough investigation, state media reported on Tuesday.
A Russian overnight missile and drone attack on Ukrainian gas production facilities killed five people, including two rescue workers, Ukrainian officials said on Tuesday, as Kyiv and Moscow exchanged rival ceasefire proposals.