>Russia starts to look very awkward if they launch a nuclear attack and it does not work. What happens next?

Yes, I've been thinking about this possibility for a while:

* Putin fires tactical atomic weapon at some empty plot of Ukrainian land, and announces it as a "demonstration" of Russian might.

* The weapon is a dud.

I'm not sure whether this outcome might not be worse in the long run, in terms of geopolitical stability, than if the weapon performs as expected!