They don't have to do that. Once we've sold out our industrial base to foreign countries for a quick buck and are dependent on those countries to sell us military hardware (stuff that we probably invented in the first place), all an enemy of the US has to do is go to those countries and "convince" them that it isn't "in their interest" to sell us that stuff anymore.
When that is done, what are we gonna do? Send our country of lawyers out to bombard the enemy with lawsuits? Send the burger flippers from Mac's out to throw their spatulas at the enemy? Not send them anymore IOUs? That'll sure scare 'em...
This country bombed a third-rate shmuck like Slobodan Milosevic into submission just because he tried to nationalize his country's mining industries, so I have no doubt that any such thing would generate a pretty harsh response from the U.S.