There might be multiple messages in this drone strike. Obviously, some oil that might have fueled Russia's invaders and/or navy went up in flames. But there's a geographic message as well. Russia's Black Sea Fleet has two major bases. The one in Crimea has been attacked recently, being well within range of Ukrainian long range assets. The other major base, Novorossiysk, is farther away from Ukrainian controlled territory. Sochi is even farther than Novorossiysk. The Russian navy was told in blunt "language" that this base, too, is subject to attack. Ukraine does not need to sink ships to overcome the Black Sea Fleet. Mission-killing enough ships to overwhelm all repair facilities would be almost as effective. Periodic attacks on main ports would be part of such a strategy.