Russia Improved Kilo Fleet Update
Russia - Navy
| Date | Dec. 15, 2025 |
| Country | Russia |
| Force | Navy |
| Ship Class | Improved Kilo |
| Ship Name | B-271 Kolpino |
| Hull Number | B-271 |
| Event | Damaged |
Description
Struck on 15 December 2025 while moored at Novorossiysk Naval Base by Ukrainian Sub Sea Baby underwater drones in the first attack of its kind against a submarine. The SBU released hacked harbour camera footage showing a massive explosion detonating below the surface near the submarine's stern and propeller section. Satellite imagery confirmed the vessel has not moved since the attack. Defence analysts assessed the damage as effectively irreparable, equivalent to a total loss. Kolpino is a Project 636.3 Varshavyanka-class submarine armed with four Kalibr cruise missile launchers, used for strikes against Ukrainian territory.