The attack with Ukrainian-made "Sub Sea Baby" drones hit the submarine in the port of Novorossiysk where Russia has rebased many of its Black Sea naval vessels to put them out of reach of Ukrainian strikes, the Security Service of Ukraine (SBU) said.

Ukraine’s domestic security service, the SBU, said Monday that it struck a Russian submarine in the Black Sea port of Novorossiysk, causing critical damage to the vessel and effectively disabling it.

Ukraine claimed it carried out an underwater drone strike on Dec. 15, the first such attack in maritime warfare, that critically damaged a Russian Kilo-class attack submarine at the Russian port of Novorossiysk,

Ukraine claims its “Sub Sea Baby” underwater drones damaged a Russian submarine at Novorossiysk, marking Kyiv’s first successful strike on a Russian submarine in the war., Europe, Times Now

At least two people were killed in a drone attack in Russia’s southwestern Saratov region and parts of Ukraine went without power following targeted assaults on energy infrastructure, local authorities said Saturday, as U.S.-led peace talks on ending the war press on.