Russia has no real military power, as the last 7 months have shown us. It was not even a founding member of the UN Security Council – the Soviet Union, a real world superpower, was.
> Now, you can say that UN failed to prevent the invasion and do its job, but expelling Russia means you’re left with no forum for dialogs and negotiations.
That's exactly my point: the UN failed to prevent the invasion, because the invading country had a veto right in all of its decisions.
Any dialogs or negotiations with Russia are an illusion of naive Western powers who don't understand how Russia really works: it doesn't care about or respect any international agreements it signs.
Source: I was born in the Soviet Union.