There are basic principles of warfare that Mr. Putin has ignored. A review of those principles suggest Mr. Putin lost even before he started into Ukraine. Or as Sun Tzu said…
“If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle.”

I submit that Mr. Putin is in that last category.

https://jessebarker-19295.medium.com/sun-tzus-and-the-art-of-war-principals-of-war-putin-has-failed-to-consider-8a17864e8ba9