According to Russian officials, a Russian tanker carrying 11 crew members was struck in a Ukrainian attack on the Black Sea. The strike caused damage to the vessel's engine room, but fortunately, no one was injured.

Ukraine has not made any public comments about the incident, but a Ukrainian security service source informed the BBC that a sea drone was utilized in the attack.

This attack marks the second instance involving such weapons within two days, with Russia not acknowledging any damage from the previous attack on Friday.

The Kerch Strait, which connects the Black Sea and the Sea of Azov, was the location of the attack and is a significant area of contention between Ukraine and Russia.

The source further revealed that the operation was a joint effort between the Ukrainian Navy and the security service, using 450kg of TNT explosives.

The tanker was loaded with fuel, they said so the "fireworks" were visible from afar.

Russia's maritime transport agency says the Sig tanker was located 17 miles (27km) south of the Crimean Bridge.

Russia's state-run Tass news agency quoted an official from the country's regional Marine Rescue Co-ordination Centre (MRCC) as saying that two tugs had already arrived at the scene of the attack - just to the south of the Kerch Strait.

"The engine room was damaged. Not much, but it was damaged," the official said.

Russia's maritime transport agency RosMorRechFlot later said the vessel had a hole "in the area of [the] engine room near the waterline from the starboard side, presumably as a result of an attack by a sea drone".

"The ship is afloat," it added.

Russian state-run media also reported that lights on the Crimean Bridge - further north - were turned off and all traffic halted amid warnings of an imminent attack.

On Friday, a Russian naval ship suffered a serious breach in a Ukrainian naval drone strike near Russia's Black Sea port of Novorossiysk, Ukrainian security sources told the BBC.

Footage later emerged purportedly showing the drone hitting the Olenegorsky Gornyak large landing ship. Another unverified video showed a heavily listed vessel being towed to port.

But Russia's defense ministry said it had repelled a Ukrainian attack on its naval base in Novorossiysk which involved two sea drones but did not admit any damage.

Novorossiysk, a major hub for Russian exports, lies to the southeast of the Kerch Strait.

Clashes in the sea have increased in recent weeks after Russia abandoned a major UN deal that enabled grain to be safely exported across the Black Sea.

Ukrainian ports have been pummelled by Russian drones and missiles, and Kyiv has threatened to retaliate.

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