If the Russian invasion of Ukraine was justified to keep NATO troops off of Russia's border, then a NATO invasion would be justified now to keep Russian troops off of the NATO border.
You can't have it both ways.
My opinion is that an invasion of a sovereign country because you don't like who they are allying with is never justified outside of a decared war. This would include the bay of pigs in Cuba, but that was a long time ago.
Furthermore, Russia's excuse that they need a neutral buffer is ridiculous. What does that buy them ? They are so outmatched by NATO that the concept of them mounting a serious defense is laughable. They could demilizarize all of continental Europe and it would maybe buy them a week if NATO got aggressive. Ukraine wouldn't give them more than a few hours.
Imaging Guatamala claiming they were justified in invading Mexico because they needed a buffer against the US LOL.
IMO if Ukraine had the nuclear stockpile of France or the UK they would have been the most powerful military in Europe. They have been fighting like the most battle hardened troops in Europe. They were much better equipped and trained than we realized.
I don't envision the rest of NATO (some not all) fighting with such resolve.
Russia is absolutely getting a bloody nose, but they are gaining very valuable modern warfare peer level combat experience.
The US and NATOs recent experience is fighting 3rd rate armies and goat fuckers with complete air and logistics superiority.
I might be an oddball in this thread because I genuinely feel and sympathize with the Ukrainian people. I do. However I also feel Russia is being demonized far more than they deserve to be. I feel they genuinely felt backed into a corner and I can't say that if my country wasn't in their shoes I wouldn't feel the exact same way. I try to make impartial fair judgements and what I see is the US and NATO have been covertly goading this war along and continually fanning the flames.
The US and NATO are essentially throwing money and munitions into Ukraine to weaken Russia but in reality it's only causing more suffering for the Ukrainian people because they are being decimated now, their cities in ruins and their economy will be in shambles. We are fighting Russia to the last Ukrainian. I am honestly to the point where if I am objectively looking at the situation fairly, Russia is entitled to and arguably should be shooting down NATO and US reconnaissance jets that are directly assisting Ukraine to kill Russians. Thats a very dangerous line we are walking.
I don't want ww3. But at the rate things are going we keep doubling down and are being pulled in by mission creep. It's almost like we are trying to get pulled into the war directly. That's sick. It's like we're trying to get Russia to shoot down one of our planes so we can get involved. Putin keeps telling us not to cross a red line and we keep sticking our toes over it each time. It's like a trespasser in your yard and you keep telling him not 1 step closer and he keeps coming, sooner or later you shoot him but who knows when that threshold is.
The world is not better off for this war. The east and west have decoupled, global commodities and supply chains are shot, there will be new alliances, the USD demise is likely accelerated etc...
And I keep asking myself is it worth it?
Was Russia even a threat to us? Seriously if Russia over ran Ukraine in 2 weeks as expected the majority of their country would still be in tact and life would more or less be back to normal. Maybe they would have established a peace agreement by now and Ukraine proper would still be Ukraine and the Donbas annexed into Russia. Likely hundreds of thousands of Ukrainians would still be alive and likely this conflict ends there. Now Russia probably can't stop. It's like of you're playing poker and you get pot committed you keep putting your chips in because now you can't afford to lose.
What the hell are we doing?