It is a sad day when a superpower has to threaten a little country like Ukraine with nuclear annihilation (of its defences)
Japan had suffered bigger daily losses in the fire bombings than the nukes. What also triggered Japan's surrender was the imminent threat of an Soviet occupation, with all its known horrors for the civilian population. (as compared with the benevolent US variety, as seen in Europe, 1945). ( ppsh41 bullets and boots vs, nylons and chocolate)
Whenever there was a moral superiority of the allies vs the Central powers, it was lost in 1945.
That is why Ukraine has that esprit de corps. it is fighting for the fate reserved for those conquered by the bear.
We would live in a better world had England issued an ultimatum to the invaders of Poland from the east too, as by treaty, in 1939,.