This WW3 scare is IMHO stupid. Just let Russia take Ukraine? Kazakhstan? Lithuania? Georgia? Finland? Sweden? Estonia? Poland?
Where do you draw the line? I don’t think any of those are acceptable. If you don’t fight a expansionist tyrant then what do you envision happens? Sacrificing innocent free countries to (maybe) appease a monster is completely out of the question.
Things can get bad if you interfere - things are guaranteed to get bad if you don’t