Let's hope Ukraine (or whatever rump is left after the Soviets [ooops, Russian fraternal brothers] gobble up their fill) is not allowed to join NATO . I can't really blame the Russians for feeling a bit annoyed/threatened even when they see the Baltic states and Poland and others in NATO. The Russian psyche is understandably paranoid and no-one really wants what they view as a hostile military entity bang on their borders. We wouldn't, the Americans wouldn't.
In a sense there are advantages to what has happened. The European states will suddenly realise it's not a good idea to be so energy dependent on Russia, and develop other energy sources. Nor to be almost militarily defence-less. Long periods of peace make people complacent.