The Ukrainian army claims to have killed the commander of Russia's Black Sea Fleet in an attack on its headquarters that took place on Friday in Sevastopol, in annexed Crimea.

"Thirty-four officers, including the commander of the Russian Black Sea Fleet, died after the attack," Ukrainian special forces said on Telegram, without citing any evidence.

"Another hundred and five people were injured. The headquarters building has not been repaired," confirmed the same source.

The AFP agency states that it cannot confirm these claims, while Moscow almost never reports losses in Ukraine, even when it comes to high-ranking officials.

Russia reported on Friday that only one soldier was missing after an attack heavily damaged the headquarters of the Russian Black Sea Fleet.

The attack illustrates the difficulty of Russian air defenses in countering regular attacks on the Ukrainian peninsula, which was annexed by Russia in 2014 and is an important logistical hub for Moscow's forces.

Ukraine has promised to return all territories occupied by Moscow, including Crimea.