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Ukraine said on Monday it carried out an underwater drone strike that seriously damaged a Russian Kilo-class submarine docked in the port of Novorossiysk, the first known attack of its kind.
The Security Service of Ukraine (SBU) said its “Sub Sea Baby” underwater drone attacked a Russian submarine equipped with four launchers for Kalibr cruise missiles used to target Kiev and other parts of the country.
The operation was carried out by the Ukrainian Navy and the 13th Main Military Counterintelligence Directorate of the SBU.
Video released by the SBU showed several ships docked at the Novorossiysk naval base in Russia’s Krasnodar region before a massive explosion occurred.
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The Security Service of Ukraine said its “Sub Sea Baby” underwater drone attacked a Russian submarine on Monday, December 15, 2025. (Ukraine Security Service via APTN)
The base has become a key refuge for Russia’s fleet as Ukraine has stepped up attacks on Sevastopol and other occupied Crimean ports.
The SBU said the submarine was forced to remain in Novorossiysk because of other Ukrainian operations, including the use of Sea Baby surface drones that drove Russia’s Black Sea Fleet out of Sevastopol Bay.
A spokesman for Russia’s Black Sea Fleet denied any damage from the attack, writing on Telegram that no submarines or crew were harmed.
Russian President Vladimir Putin visits destroyer Vice-Admiral Kulakov at the Black Sea Fleet naval base in Novorossiysk, Russia, September 23, 2014. (Sasha Mordovets/Getty)
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,[Ukraine] “Proving once again that minnows can swallow sharks using innovation,” drone expert Brett Velikovich told Fox News Digital. Underwater drones are the next evolution in drone warfare.
The submarine attack comes as Russia continues massive drone and missile attacks on Ukraine and the United States works to end Russian President Vladimir Putin’s war.
A mother cries over the coffin of her son Oleh Borovik, a Ukrainian soldier who was killed in fighting with Russian forces near Pokrovsk, during his funeral ceremony in Boirka, Ukraine, on December 3, 2025. (Evgeny Maloletka/AP)
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Ukrainian President Volodymyr Zelensky and his negotiating team met with US special envoy Steve Witkoff and President Donald Trump’s son-in-law Jared Kushner in Berlin on Sunday to discuss security guarantees for Ukraine.
Zelensky also talked He met with European leaders earlier in the week on a comprehensive political framework to end the war, ensure long-term security for Ukraine and support the country’s post-war recovery.
