THE ADMIRAL VLADIMIRSKY PASSED SEVERAL OFFSHORE WIND FARMS. Source: Putin’s Shadow War
The Telegraph reports Russia is believed to be mapping NATO offshore energy industry and communications cables as possible targets should there be a wider war between Russia and NATO.
“A fleet of Russian boats, often disguised as fishing trawlers or research vessels but with armed guards, have been observed by European intelligence agencies conducting mass reconnaissance close to British coastal energy and communications networks.”
The same report notes a surge in hacker attacks on NATO infrastructure.
Chuck Hill's CG Blog 
We’re fortunate that Finland finally joined NATO this month — and not a minute too soon! Let’s hope Turkey allows Sweden to join soon, as NATO needs their patrol boats & patrol ships in the Baltic Sea area, too. Well, obviously the Swedish boats and ships are already there, but I mean that once they’re NATO members, then NATO can coordinate the patrols better.
Another look at this story from a Danish author. “Russian ‘Spy Ship’ in the North Sea Raises Concerns About Maritime infrastructure Security” https://www.marinelink.com/news/russian-spy-ship-north-sea-raises-504572
Another report with a bit different slant. https://gcaptain.com/russia-sabotage-ships/