Of the many ridiculous things Russia has done to humiliate and debase itself in this stupid vanity revenge project, making no provision at all for serious border defense may not be most manically immoral, but it may be the most militarily stupid.
For all their bluster about nukes - how are you going to use them exactly? On the Ukrainian territory you claim is yours, or on the Russian territory that is currently occupied by Ukraine.
They’re just so fucking stupid.