I’m curious how it’s legal to size a ship in international waters under any circumstances? We have a word for that - piracy.
By the plain text of international law a state cannot commit piracy since piracy specifically only applies to private actors.
> Piracy consists of any of the following acts: (a) any illegal acts of violence or detention, or any act of depredation, committed for private ends by the crew or the passengers of a private ship or a private aircraft...
https://www.un.org/depts/los/piracy/piracy_legal_framework.h...
Maritime law exists, and enforcing it is not an act of piracy.