"he is not suicidal" first how do You know much of anything about what's in Putins head?
Maybe he's not suicidal ... But he is a maniac / psycho like Hitler and we know how that ended; he blamed Germany and went down 👇👎 and he knew he was fucked.
Putin cannot lose power or he knows he's fucked... If he is fucked ; you really don't think this psycho would nuke?
There are many possibilities to how this all ends.
Ye, "allow" / help.
If Russia doesn't have intervention and doesn't get reformed by other countries it will ALWAYS go back to its corrupt/crooked ways. If it's closed off like North Korea it will absolutely be even more extremist then now. And now is pretty fucking bad already.
Think Japan and Germany... If they didn't have the world get involved, they'd still be what they were in WW2.