While tens of thousands of people have joined Facebook groups in Sweden and Denmark calling for no longer buying American, Norwegian company Haltbakk Bunkers has announced that it will stop supplying US military vessels with fuel.
American here: genuinely, go for it. If you want to be even more highly targeted, you can also take a page out of Canada’s book: they’re encouraging people to target things that are produced in red states specifically, in addition to a general push for a boycott. Bourbon (from Kentucky), for instance.