What amazes me on Nuclear Weapons is the fact we haven't already used a bunch. These have been considered in every war/conflict since their initial use in WWII. There was a plan on them during the Korean thing, and they have been kept as an option ever since.
All I can say is that cool heads must have always prevailed.
The end of cool heads may be in sight in the next "deal". Now we have smaller nukes, the so-called "tactical" ones. Like taking out some specific stuff, not wholesale destruction of a whole city or region. The tests video from Marius, above is very interesting. These are probably the known detonations. How many others in black budget scenarios have been used? Maybe to create the underground military bases, etc.
OH OH--I forgot my tin foil hat so I will have to close here.