Ukraine used British cruise missiles in a significant attack against the headquarters of Russia's Black Sea Fleet in occupied Crimea, Sky News understands.

Admiral Sir Ben Key, the head of the Royal Navy, was asked about the Sevastopol attack during a speech at an arms fair in London.

He did not talk about any specifics and was not asked about the potential involvement of missiles given by the UK, but he said: "[The Ukrainians] are demonstrating what can be done through innovative thought processes and a willingness to take risk.

Mikhail Razvozhayev, the Moscow-installed governor of Sevastopol, the largest city in Crimea and a major Black Sea port, said on Telegram that at least 24 people were injured.

The strategic shipyard on the peninsula, which Russia annexed from Ukraine in 2014, builds and repairs ships and submarines of the Russian Black Sea Fleet.

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