Warum zum Teufel ist Russland im UN-Sicherheitsrat?

because

a) if we would expel countries that we don’t like from this council there would be no council. It makes sense to have an institution of large powers to talk, even if they don’t like each other at all.

b) more importantly, it is a way of the winning powers of world war 2 to project power over the rest of the world. That’s why China and Russia are on it. It is less a “we want equal peace for everyone” and more a “we are in charge” thing.