The Security Service of Ukraine (SBU) and the Ukrainian Navy attacked the Buyan cruise missile carrier and the ship Pavel Derzhavin with naval drones with experimental weapons, a source in the SBU told Interfax-Ukraine.

"Today's attack on the Buyan missile carrier and the day before yesterday's explosion of the Derzhavin were the work of the Security Service together with the Ukrainian Navy," the agency's interlocutor said, adding that both vessels were hit by Sea Maliuk (baby) drones with experimental weapons .

"After the first explosion, Russian minesweepers and divers were unable to detect our know-how. Yesterday, the Alrosa submarine was lucky, which so far managed to escape from our developments. The Buyan cruise missile carrier could not repeat the Alrosa's feat, that's why it was hit today in a Sevastopol raid with the experimental weapons of the Sea Maliuk," the source said, referring to one of the organizers of the special operation.