[beerandt]

>US nuclear weapon stockpile will only be enough to neutralise just one military superpower

Well that's not true. And it's especially not true with the new ICBM fuses and bomber launched stand-off missiles. The newly equipped icbms are an approx. 3x multiplier compared to having the same number of weapons a decade ago.

Which frees up weapons to be shifted either to new targets, or from strategic use to potential tactical use, with the new lower adjustable yields.

So even WW3 trench warfare has a good chance of still being nuclear warfare.