Two of Ukrainian drones in an offensive attack have allegedly bombed oil reservoir in Russia controlled Crimea.

Videos posted online showed a massive fire erupted at the oil depot in Crimea after it was hit by drones.

A Russian-appointed official reported the attack on Saturday.

The attack, it was gathered, it’s the latest in a series of attacks on the Black Sea annexed peninsula as Russia braces for an expected Ukrainian counteroffensive.

Ukrainian military had on Friday held drills to prepare its soldiers for offensive actions against Russia.

Thick Smoke and flames could be seen in videos posted online rising from burning fuel tanks in Sevastopol, Crimea.

Mikhail Razvozhayev, the Moscow-installed governor of the port city of Sevastopol in Crimea, posted videos of the blaze on his Telegram channel.

Razvozhayev said, according to AP news agency, the fire at the city’s harbor was assigned the highest ranking in terms of how complicated it will be to extinguish. However, he reported that the open blaze had been contained.

Razvozhayev said the oil depot was attacked by “two enemy drones,” and four oil tanks burned down.

“A third drone was shot down from the sky, and one more was deactivated through radio-electronic means”, according to Crimea’s Moscow-appointed governor, Sergei Aksyonov.

It would be recalled that Russia took over Crimea from Ukraine in 2014.

Ukrainian President, Volodymyr Zelenskyy in an interview during the week reportedly said that his country will reclaim the peninsula in the upcoming counteroffensive.

President Vladimir Putin of Russia had traveled to Crimea last month to mark the ninth anniversary of the Black Sea peninsula’s annexation from Ukraine. Putin’s visit took place the day after the International Criminal Court issued an arrest warrant for the Russian accusing him of war crimes.

Meanwhile, the Russia installed official in Crimea said that there were no casualties, and that the incident would not hinder fuel supplies in Sevastopol.