@dcoderlt well in fairness even Germany was eventually welcomed back to "the world". After an unconditional surrender, the Nuremberg trial and 44 years of being split in two.
In Russia's case they should leave Ukraine. ALL of Ukraine, including Crimea. And then make reparations for the damage and hurt they caused. And that's barely enough for starters.
But after something like that, sure. We can't hold a grudge forever.