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Ukraine says underwater drones hit submarine, but Moscow denies damage

Ukraine’s Security Service said the underwater drone strike caused critical damage to a $400 million Russian Kilo-class submarine, marking the first such attack on this class, the SBU said.

  • On Dec. 15, Ukraine's Security Service said Sub Sea Baby underwater drones blew up the Russian submarine 636.3 "Varshavyanka" in Novorossiysk.
  • Kyiv intensified use of domestically produced maritime drones to push Moscow's navy to mainland ports, including Novorossiysk, targeting a submarine carrying four Kalibr cruise missile launchers.
  • In a joint operation, the 13th Main Directorate of Ukraine's Security Service and the Naval Forces of Ukraine conducted the strike, while Sea Baby surface drones forced the damaged boat to remain in Novorossiysk port and drove Russian vessels out of Sevastopol Bay.
  • The submarine, estimated at 340 million, sustained critical damage and was effectively put out of action, the SBU said, with rebuilding costs up to $500 million due to international sanctions.
  • Historically, another Varshavyanka-class boat, "Rostov-on-Don," was damaged in Sept. 2023, and the SBU says underwater strike drones mark an evolution in Ukraine's strategy to undermine Russia's missile strikes.
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Lean Left

The Ukrainian Security Service (SBU) announced this Monday that its Sub Sea Baby drones reached a submarine capable of launching Kalibr cruise missiles while parked in the Russian port of Nororosíisk

·Spain
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Right

On Monday, 15 December, Ukraine claimed responsibility for the attack on a Russian submarine moored in the strategic port of Novorossiysk, in the Black Sea. According to the Ukrainian security services (SBU), the attack was carried out with the help of a new generation naval drone: the "Sea Baby", a weapon now emblematic of the Kiev-Moscow maritime war. "For the first time in history, Sub Sea Baby submarine drones hit a Kilo-class Russian submar…

Lean Right

The Ukrainian Security Service (SBU) stated that the Russian submarine hit "carrying four Kalibr cruise missile launchers, which the enemy uses to hit targets in Ukraine".

·Paris, France
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Center

How did a Ukrainian underwater drone strike and destroy part of a Russian submarine in the port of Novorossiysk? The operation carried out by the Kiev Security Service...

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n-tv.de broke the news in on Sunday, December 14, 2025.
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