Even with nuclear annihilation, NATO could still get to Moscow in a three day operation. It’s just a question of which cities back home are still standing.
Moscow is not the big prize you might think it is. Russia can just retreat hundreds of kilometers further east and carry on.
NATO can do the thunder run, but they are not equipped to win a massive land war in Asia. You really gotta listen to the Sicilian from Princess Bride on this one.