Doh, Danielf beat me to it.
I suspect the whole invading The Netherlands is more of a strongly worded bluff than anything. They are allies by NATO, so it would probably be sorted diplomatically rather than a military rescue operation, but congress have reserved the right to sanction miltary action if it ever got that far. Even so I don't think it would happen, with NATO knowing the score about the US, they would ever try and defy them. Don't forget, if it ever happens, the enemy wouldn't be The Netherlands, nor NATO. The ICC is UN based, so all UN countries would liable to stop the American rescue operation. The UN would never do that. The world knows it needs the US more than the US needs everyone else, so it would all get settled somehow.