Most European countries barely have a standing military to defend themselves, they're completely dependent on the USA for defense through NATO. And their leadership is so docile and complacent that I can't see them being able to muster up a strong resistance to any incursion, most likely if there was an actual invasion of The Hague they would let America do what they need to and try to return back to business as usual as quickly as possible. Again, they're not the types to think beyond the status quo.
"Most European countries … are completely dependent on the USA for defense"
Only if invaded by Russia and possibly China. And even then only the little peripheral ones. UK, Germany, and France could handle Russia - up to and including nukes.
For any conceivable military or paramilitary invasion from the rest of world, Europe will do just fine.
And sadly (an a bit off topic) , Europe — well Denmark at least — is most likely to face an military invasion from the USA.
