Admiral Viktor Sokolov - the commander of Russia's Black Sea Fleet and one of Russia's most senior naval officers - was reportedly killed in last week's strike on the naval port of Sevastopol, according to Ukrainian officials.

The Russian Defence Ministry did not immediately respond when asked by news agencies to confirm or deny if Mr Sokolov had been killed.

However, the ministry released a video on Tuesday appearing to show Mr Sokolov attending a conference with other top Russian military officials via video link.

Mr Sokolov was not seen speaking in the footage of the conference - led by Russia's defence minister Sergei Shoigu.

It is not clear when the footage was filmed, though Russia's defence ministry claimed the meeting took place on Tuesday.

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Ukraine special forces said on Telegram: "Since the Russians were urgently forced to publish a response with Sokolov allegedly alive, our units are clarifying the information."

In the video, Mr Shoigu said more than 17,000 Ukrainian soldiers had been killed in September and that more than 2,700 weapons, including seven American Bradley fighting vehicles, had been destroyed.

Both Russia and Ukraine have at times exaggerated enemy losses in the war, while also saying little about their own losses.

On Monday, Ukraine's special forces claimed they had killed Mr Sokolov and 33 other officers in last week's missile attack on the headquarters of Russia's Black Sea Fleet in Sevastopol.

"After the strike on the headquarters of the Russian Black Sea Fleet, 34 officers died, including the commander of the Russian Black Sea Fleet," Ukraine's special forces said on the Telegram messaging app.

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"Another 105 occupiers were wounded. The headquarters building cannot be restored."

Kremlin spokesman Dmitry Peskov declined to comment on Ukraine's claim that it had killed Mr Sokolov, instead referring reporters to the defence ministry.

In a statement after the attack, the Russian defence ministry said one serviceman was missing, revising an earlier statement that the man had been killed.

Moscow-installed authorities in Sevastopol also said they were taking extra measures to address Ukraine's increased attacks on Crimea.

The attack came after an earlier strike on Sevastopol, in which a Russian submarine and warship were damaged.

A Ukrainian and a Western source said that British Storm Shadow cruise missiles were deployed in the attack on the port of Crimea, which Russia annexed in 2014.