However I'd only apply this logic of attack to the west and Russia...China/NK etc are a different kettle of fish.
Good point - though like ourselves China's nuclear capabilities are more of the retaliatory - make it too costly for someone to want to attack us variety rather than a potent first strike capability (unless they've hidden stuff very well).
NK is another matter again - their mentality when it comes to nuclear weapons is very different to even China - if anyone was to actually use one either an actual attack or show of force I'd put bets on it being NK (because they just don't see the consequences the same way as we do in the West).