The command of the Russian Black Sea Fleet has almost certainly relocated its Kilo-class submarines from its home port of Sevastopol to Novorossiysk in the Krasnodar region of southern Russia.

 This is stated in the daily report of British intelligence.

 "It is very likely that this was done due to the recent change in the level of the local security threat due to the strengthening of Ukrainian long-range strike capabilities. In the last two months, the fleet headquarters and its main naval aviation airfield were attacked," the report says.

 It is noted that the guarantee of basing the Russian Black Sea Fleet in Crimea was probably one of the reasons that prompted Russian President Vladimir Putin to annex the peninsula in 2014.

 "Currently, the security of the base is directly undermined by Russia's ongoing aggression against Ukraine," the message reads.

 It will be recalled that British intelligence believes that during the entire period of the full-scale war, the Russian Federation lost approximately 55 combat aircraft, and the lack of superiority in the air is one of the factors of the failures of the Russian army.