During the hot phase of the war it has directed a drone and missile campaign in the Black Sea. It is likely responsible for current attacks against Russia related sea transport. It is developing new naval drones for further assaults on Russia.

Britain had initiated and run massive public relation campaigns blaming Russia for various outrages which, in fact, never had happened. Consider the Skripal Affair, the MI6's Steele dossier used to launch Russiagate and other operations launched through the anti-Russian Integrity Initiative run by the UK government's Institute of Statecraft.

It was the Brits who, during the war in Ukraine, directed the Black Sea Attack Network (BSAN) to push the Russian fleet out of Sevastopol in Crimea. British Storm Shadow missile were fired against various ships. Directed by British signal intelligence seagoing drones,  made in Britain, attacked Russian transports as well as the Kerch Bridge.

As the Armchair Warlord explained:

The BSAN sea drone program scored a number of successes and hair-raising near-misses over the course of 2023 and early 2024, most notably sinking the Tarantul-class missile boat Ivanovets with what was likely some loss of life on February 1st, 2024. At that point I suspect that the Russian Navy decided that something had to be done and, having carefully studied their foe, put a plan into action to destroy what was to them the most concerning part of the BSAN – the maritime drone program.

Using a few rusty old ships as bait the Russian command observed the signal activities during Ukrainian attacks, uncovered the British run network, and finally killed it:

Deployed without support in the Kerch Strait during a large-scale (albeit unsuccessful) aerial drone raid, the Kotov attracted the attention of Ukrainian sea drones heading for another round with the Kerch Bridge. Video from the battle again suggests only a modest defensive effort with small arms, with subsequent reports that the ship was abandoned quickly (with few to no Russian casualties) and basically allowed to sink. It's noteworthy that the remaining drones were, again, easily mopped up by rescuers. And here, after this engagement, the Black Sea Attack Network was undone.