Earlier quoted context omitted.
Would you define Russia not nuking Ukraine as "strict pacifism"? Because every modern country and army seems to have some basic standard of ethics and morals that restrict them from waging total war even if you want to argue that's purely for diplomatic or PR reasons. There are a whole lot of decisions that need to be made to get from "strict pacifism" to total war, so I don't know why we need to flatten this into a…
Russia not nuking Ukraine had nothing to do with ethics or morals. It's more pragmatic than that. Putin wants to take Ukraine largely intact to control its population and resources, not turn it into an irradiated wasteland. And he knows that use of WMDs would invite economic sanctions from key neutral trading partners such as India. Also, it's questionable whether Russia's nuclear arsenal would even work reliably. Th…
Nuking Kyiv, Odessa and Lviv would probably force Ukraine to surrender.
> use of WMDs would invite economic sanctions from key neutral trading partners such as India
This is the real constraint. There is still the credible threat of being economically isolated by America, Europe, China and India. (Neither China nor India wants the normalisation of nuclear bombardment normalised. They both have border disputes with nuclear-armed neighbours.)