Ukraine has delivered a historic blow to Russia’s Black Sea Fleet after an SBU-operated Seababy underwater kamikaze drone struck a Kilo-class submarine at the port of Novorossiysk. The attack—confirmed by Ukrainian security officials—marks the first-ever underwater drone strike on a submarine in naval warfare. The damaged Project 636.3 Varshavyanka-class sub is effectively out of action, leaving Russia with only two operational Kalibr-capable submarines in the Black Sea. With the Montreux Convention blocking replacements and repairs outside the region, the loss exposes Russia’s growing naval vulnerability and Ukraine’s rapidly evolving asymmetric warfare capabilities.
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