Skua

Ahh shit, I had just assumed that the gulf of Finland was narrow enough that it was all someone’s territorial water, but it isn’t. Thanks for the correction, I will edit a note into my comment

Regarding the marines thing, that was not because I thought Finland actually had used them, more an “if the crew actually did try to fight about it, Finland is quite capable of winning that fight”

Edit: I thought that the gulf of Finland was narrower than it is, and this affects the relevance of my comment. See boredtortoise’s reply below

Under UNCLOS at least, a country can board a ship within its territorial waters to investigate a crime “if the consequences of the crime extend to the coastal State” (and some other reasons). Sinking it is almost certainly illegal, but it’s an unarmed ship and Finland has marines so I can’t imagine that they’d have much trouble boarding it if they wanted to

In theory Kenya is leading the intervention, but it has gotten off to an awfully slow start. Kenya should probably be able to handle this if given a bit of financial assistance to run the operation, as it’s a fairly big and stable country, but… well it hasn’t managed much yet.