Is Russia losing the upper hand in the Black Sea?

 

Ukrainian intelligence sources say a Russian warship has been damaged in a drone attack on Russia's Black Sea naval base in Novorossiysk. This video published on social media appears to show the seaborne drone moments before it hits the ship. Ukraine says the Russian vessel was seriously damaged. Other online videos show the Russian landing ship listing and being towed to shore. Russia's defense ministry says the Ukrainian attack was foiled, and did not admit any damage to its warship.