Authorities in Moscow say a Russian tanker has been attacked by drones in waters off the eastern Crimean Peninsula.

The country's transport authorities announced on social media on Saturday that drones punched holes near the ship's starboard engine room. They say none of the crew were injured.

Ukrainian media quote sources related to the Ukrainian Security Service as saying the attack was carried out jointly by the Security Service and the military. They say the tanker was carrying fuel for the Russian military.

The Ukrainian side has not made any official response.

On Friday, Russia reported that a Ukrainian drone had damaged a Russian landing ship at the naval base in Novorossiysk in southern Russia near Crimea.

The British Defence Ministry said on Saturday that "the Russian Navy landing ship Olenegorsky Gornyak almost certainly suffered serious damage."

It says the ship is the largest Russian naval vessel to be seriously damaged or destroyed since Ukrainian missiles destroyed the Moskva cruiser, the flagship of the Russian Black Sea Fleet.

The ministry says, "This is a significant blow to the Black Sea Fleet, which previously relocated most of its units to Novorossiysk due to the high threat to the military port of Sevastopol.