Offer these tanker and shipping companies the following deal - you’ll put a squad of Marines, Rangers, Navy Personnel, what have you - on board and in civies. First sign of trouble, and they break out the RPGs and machine guns. With HEAP rounds.
And promises not to rescue or call for help to boats so sunk.
Problem solved. Once they figure out they can’t tell which ship has a few “extra crew” on board, the damn pirates won’t so much as fish. if a capital vessel comes within sight of shore.
And don’t even tell them at first. After a few of the assholes get blown to Hell, just shrug and say, “h yeah. New program.” No need for a big show of force. The “Feel lucky, punks?” factor will do the rest.
Well, that and you have to give them full and advance authorization to punch the cards of pirates with extreme prejudice.