A quick, and belated, point to make -- for what it's worth.
- Actually, two of them, come to think of it.
Hitler's forces INVADED other European countries. They weren't 'allies' except through coercive force applied by the occupying power.
If you're looking for a REAL ally of Hitler's ... try ... STALIN. Funny how you overlook the fact that, before they ultimately became enemies, Hitler and Stalin were politically friendly, and entered into a joint pact.
As the saying says ... people in glass houses shouldn't throw stones ...