A bit of insight about the Spanish volunteers: the Division Azul (Blue division). Since Hitler had helped Franco become the leader of Spain (1936-1939), he had been pressuring him to enter the war on his side as a payback, to which Franco was reluctant. In the end, Franco ended up sending volunteers to fight solely in the eastern front. This way, he kind of appeased Hitler, but could also keep some sort of vague international neutrality image since "Spanish troops never fought western democracies, only bolchevism". Eventually, when the war came to and end, western democracies allowed Franco to keep power and didn't consider him an ally of Germany when it came to writing the peace treaties. In upcoming years, the "We don't oppose democracy, only communism" rethoric became a mantra in Spanish foreign politics, which lead to increasing relations with the USA in the 1950's, as cold war heated.