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.

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 cheap, effective drones boost defense and exports, but extensive politicization and complex bureaucracy risk slowing production at a critical moment.

Ukraine's drone schools are preparing soldiers to take on Russia and working to keep pace with an ever-changing fight.