My instinct is that there are a lot of a potentially good reasons not to let them into the EU, and maybe even ones for kicking them out of NATO, but "they want

My instinct is that there are a lot of a potentially good reasons not to let them into the EU, and maybe even ones for kicking them out of NATO, but "they want to sell their minerals to other countries" doesn't strike me as a reasonable gripe in terms of NATO at least.