Agreed on all but your last sentence: Tow the tankers to S. Korea or Japan; sell ships and oil to finance further surveillance. No need for a big oil slick... ;-)
Yeah, my sympathies are with the crews of the violating ships. Faced with being sunk on the high seas in winter the crews will ask for significant pay raises or refuse the job.
I’m good though with the ships being seized and sold at auction in Japan or South Korea. I’d spice it up a little and offer their crews a 10% cut of the sale price.
Free Enterprise drains all kinds of swamps.