Ukraine’s military intelligence says it sank a Russian warship off the coast of Crimea overnight into Thursday, landing the latest in a series of blows to Russia’s Black Sea Fleet after mounting a “massive” missile attack on the occupied peninsula hours earlier.

Russia’s guided missile ship, the “Ivanovets,” suffered multiple hits to its hull before it sank overnight in the harbor of Lake Donuzlav, Crimea’s deepest lake, Ukraine’s Defense Intelligence said.

Night-time footage supplied by Ukraine showed naval drones racing toward the Russian ship before exploding on impact, causing significant damage to the vessel. At the end of the video, the ship appears to have sunk, with just its bow above water. CNN could not independently verify Ukraine’s claims and it is unclear from the footage which vessel was struck and when.