How was the relationship between Hitler and the non Germans?

That depended on who that 'non German' was...

If that where an ari-race, like the Swedes, Dutch or, for that matter, Dennish, he did not dislike them especially. However, if that 'non German 'was a Jude... That was altogether annother thing. He hated the Jews. And many other non arian races as well.