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 President Donald Trump said an angry Israel "violently lashed out" and attacked Iran's major gas field, a significant escalation in the US-Israeli war, but ruled out further such attacks by Israel unless Iran retaliated further.
Israel reopened the Rafah crossing with Egypt on Thursday after nearly three weeks to allow some wounded Palestinians to leave for treatment, after Gaza medics said Israeli strikes had killed four people in the enclave.
Saudi Arabia reserves the right to act militarily against Iran and any trust with Tehran has been shattered, the Saudi foreign minister Prince Faisal bin Fahran said early on Thursday, after Riyadh was targeted by Iranian ballistic missiles.
Kuwait Petroleum Corporation says one of the operational units at the Mina Al Ahmadi refinery was hit on Thursday by a drone, resulting in a "limited" fire.