Finland detects strike on Russian warship; Ukraine claims attack
Sviyazhsk (Buyan-M) (Project 21631) class corvette Grad (575), commissioned in 29 Dec 2022, one year before sister-ship Naro-Fominsk (595). Naro-Fominsk was reportedly struck by Ukraine in the Gulf of Finland on 11 November 2026. (Michael Nitz)
The Finnish Defence Forces ( Puolustusvoimat : FDF) detected a strike against a Russian warship in the Gulf of Finland on 11 November 2026 and has monitored developments since, an FDF spokesperson told Janes on 12 November.
There is no immediate military threat to Finland, and the security situation in the Baltic Sea remains stable, the FDF spokesperson said. The FDF would not disclose further details about the incident's location or timing, or how it was detected and identified.
Ukraine's Security Service (SBU) said it had planned and carried out an attack on the Project 21631 Buyan-M-class small missile corvette Naro-Fominsk . The SBU did not specify the weapon used or provide evidence of damage caused to the vessel.
The SBU linked the attack to a wider operation against port, oil-processing, and transport infrastructure at nearby Ust-Luga near St Petersburg on the night of 11 November. The Armed Forces of Ukraine said five oil-product tanks, with a combined capacity of 150,000 m 2 , were damaged, and a large fire broke out.
The Buyan-M can carry Kalibr cruise missiles and P-800 Oniks anti-ship missiles, the SBU said. Russian forces have used both missile types in attacks on Ukraine.
Commissioned on 23 December 2023 and assigned to Russia's Baltic Fleet, Naro-Fominsk is 74.1 m long, has a beam of 11 m, and displaces 949 tonnes. It has a top speed of 25 kt and is armed with a 100 mm A-190 gun.
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