Screengrab from X video Ukrainian Navy said it destroyed a Russian-flagged support vessel with a naval drone in the port of Sochi on Sept. 3. The vessel, Nefrit, was hit by an unmanned surface vessel (USV). Nefrit is a multipurpose support ship used for oil and gas operations, offshore facilities, cargo and personnel transport, and underwater technical work. The attack was part of a series of Ukrainian attacks on Sochi on Sept. 3-4. Ukraine said the attack damaged Russian logistics and specialised maritime equipment linked to its maritime and energy infrastructure. Video released by the Ukrainian Navy showed an explosion and smoke near the vessel. Explosions Reported in Sochi Several explosions were reported in Sochi during the attacks. Sochi Mayor Andrey Proshunin warned residents at about 6 a.m. local time on Sept. 3 that there was a threat of a USV attack. About 30 minutes later, he issued an all-clear. He did not give details about what had happened. Several separate reports said an explosion took place near a Russian Pantsir air defence system at the port. Later that night, videos posted by several Russian Telegram channels appeared to show a fire at an oil depot following an aerial attack. The moment of today’s explosion of a Ukrainian surface kamikaze drone next to a Russian ship in Sochi. pic.twitter.com/zpavwj97BW — MilitaryNewsUA (@front_ukrainian) September 3, 2026 Long-Range USV Strike The attack on Nefrit was one of the farthest reported Ukrainian USV strikes against a Russian target in the Black Sea. Sochi is about 350 miles from the nearest Ukrainian-held territory in a direct line. A USV travelling from Ukrainian-held shores would have to travel farther by sea. The attack appears to be the first known Ukrainian USV strike on Sochi. The city has previously been targeted by Ukrainian aerial drones. Ukraine has used naval drones against other Russian targets in the Black Sea. In 2023, a Ukrainian USV struck the Russian Ropucha-class vessel Olenegorsky G