Earlier quoted context omitted.
You have to ask yourself what he would achieve by using nuclear weapons, and what the costs would be. Using nuclear weapons seems unlikely to benefit the Putin regime in any way, and risks destablizing his position, both from inside and outside Russia. Putin is not crazy, he is acting rationally from his perspective (though it may be hard to understand). My suspicion is that the reports of him having cancer are corre…
> Putin is not crazy, [...] the Ukraine invasion was a way to bolster and secure his position in the face of doubt caused by the cancer. Although I (think I) know what you mean, the idea of starting a war, killing thousands of people, destroying cities and destroying the Russian economy all to avoid looking weak due to cancer... well, it certainty sounds pretty fucking crazy to me.
I think Putin believed that this would be a quick victory, capturing the Eastern oblasts, and either negotiating a settlement with the Ukrainians, or conquering the country and installing a puppet regime. This is what most analysts seem to have expected, and the fierce Ukrainian resistance is what's forced the West to implement strong sanctions.