Russia's Black Sea Fleet warships take part in the Navy Day celebrations in the port city of Novorossiysk on July 30, 2023. (PHOTO / AFP)

KIEV - Ukrainian experimental sea drones attacked two Russian vessels in the Black Sea, the Ukrainian government-run Ukrinform news agency reported Friday.

The drones nicknamed Sea Baby hit Russia's Buyan missile ship on Friday near the city of Sevastopol, while the Pavel Derzhavin patrol vessel was struck on Wednesday, said the report.

Later in the day, Dmytro Pletenchuk, the Ukraine navy spokesperson, said that the Pavel Derzhavin vessel was hit for the second time on Friday.

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Sea Baby is a maritime kamikaze drone capable of carrying 850 kg of explosives, according to media reports.