If something bad happened to a mostly empty Russian shadow tanker in the Gulf of Finland, that impact is going to be mostly confined to Russia. i.e. past the major Finnish and Estonian ports.
As long as we're all playing silly only-kinda-deniable games, that's an option on the table.
Except it isn't in the Gulf of Finland but the East Sea or Soth China Sea. Most of these ships are transporting oil to China, India, Singapore, The Middle East. The only allies able to interdict most of these ships are Japan and South Korea. Japan doesn't engage in such activities after WW2 and South Korea is reluctant to because of retaliatory actions from Russia and China. Maybe they'll change course after the DPRK has sent triops into Ukraine, but don't hold your breath.
What exactly do you think we spend all that money on fast attack subs and frigates and destroyers for? Of course the US Navy (and the French and British) can interdict those ships anywhere on the high seas.
