

Kinda? The Finns seized a Russian dark fleet vessel with their military and if I remember correctly held her for several days.
There is a LOT of discussion about “safe passage” going on in the EU right now regarding this kind of ship. They are very dangerous because they have no P&I insurance if they have a spill (and you bet your ass they are not maintained to any remotely reasonable standard).
Again, I am not personally in favor of this stuff. Dangerous and irresponsible in multiple ways.

You can track them: https://globalfishingwatch.org/our-map/
You have to sign up for a free account to get the good data. It’s actually not a bad sub for Marine Traffic, Lloyd’s, Seaweb, etc. It has all ships not just fishing ships, and it has satellite not just terrestrial data.
How to search effectively gets a bit of getting used to.