I wanted to do a quote-reply type of thing but since so much has been posted let me just make some short (yes I know I usually expand too much... somewhat like Russia) answers, if anyone is interested given
@PeroK took my one mistake earlier and said he then questions everything I have said so far.
@russ_watters let me answer you since you raised the point multiple times here,
The buffer zone idea is simple, nobody , at least not me, is saying that Russia needs buffer zones because NATO will attack it, truth be told I don't even think Putin believes that. But this is not the issue don't you understand? The issue is simple, take a map, (I already somewhat explained this in detail previously but it seems few took me seriously) now look at the countries bordering Russia from all western side, almost all European countries, now include Ukraine in them also and suppose all these countries have weapons systems within them near the border, systems that you don't control!
This is not about whether someone will use those systems or not, it's simply about the FACT that they are there and that's it.
Russians , not just Putin by the way , there is quite a percentage of people in Russia who don't exactly like that. It's not about the threat it's about the fact that you have less and less control over your backyard.
Now do these political and military wishes and interests of Russia coincide with the interests of the small republics that border Russia? Of course not , but they have never coincided , never!
It's not like we border Russia for the first year , we live here for more than 1000 years, arguably even more.
We have had disputes over the border and who will control who and what since that time.
Now, so what is the solution?
Here is my take , arguably a rational one. Especially given this is my direct interest and area of concern, I'm literally sitting next to Russian thermonuclear missiles! (which might be a good thing, given the yield you wouldn't want to drop them so close to home...

)You cannot have a scenario where Russia is completely buffered up and surrounded from all sides with weapons even if nobody attacks, that simply will never work, it has never worked for any large country, truth be told not even US. Another factor is the enemy close by archetype, especially if you are not all that successful like Russia was in the 90's, look at Germany, one of the reasons Hitler was successful is because Germans felt betrayed and ridiculed after WW1, so came WW2. Remember dictators are not exactly lone wolf players, you have to have a large support in order to make ordinary people with a family of 3 children take up uniforms and murder Jews by day while read children's books to their kids by evening...
NATO already expanded much further than it could have ever dreamed off, no American president before 1990 would ever even in their wildest dreams think that one day NATO will be 300 miles from Moscow!
The problem with world powers often (both Russian and US) is they don't know when enough is enough!
You reach the balance point and then you keep it, balance in international politics is a fine tuning thing, you have to be careful, just because something looks right doesn't mean it has to be done.
We had an almost balance like state so far, before the Ukrainians started revolting in 2014 we had I'd say he most peace we have ever had here.
Teasing Ukraine with the option of NATO and telling Putin he will have to be ok with US tanks within Ukraine which apart from Russian propaganda is indeed the historical seat and cultural center of the Russian empire was a bit too much, it's sort of like meeting your new girlfriend and then pushing her into sexual relationship the next day, you can't move that fast or that far.I know this sounds bit selfish, one could say "yes you got NATO and now when others want the same you say - no for you" but this is a political reality.My own idea is that Ukraine should have been given guarantees that it will be able to join EU but not NATO, while Russia should have been told to keep out of Ukraine , so as long as they keep out of Ukraine NATO doesn't step in but if Russian interferes with Ukraine then NATO will help them.
Instead what happened is this. NATO dangled the option for Ukraine to join, Zelensky being a smart and young man spent much time traveling abroad pushing everyone to accept Ukraine in both EU and NATO, meanwhile Russia was somewhat left out of the dialogue , and now Putin is in Ukraine with force.And please respect my opinion, I am not pro anybody here I'm trying to be as neutral as one can be, but bad politics is bad politics I have to call it out.
My former driving instructor said once "if you make the right choices you can avoid any accident" at first I kind of thought his nuts, but then it settled to me, indeed just like in chess, you make a couple of bad moves from the start and you lose at the end.
This in no way or form "whitewashes" Russian imperialist past nor their current aggression, but every coin has two sides. My take is this could have been avoided.