There was a “chain of events” that led up to WW2 as well. Germany did have actual grievances. That still didn’t justify any of Hitler’s actions in the least bit, nor did it make any of the people who excused his actions on that basis any more morally correct.
The parallel is that Germany didn’t think Czechoslovakia and Poland had the “right” to ally with Britain and France, much as Russia doesn’t think Ukraine has the “right” to be a part of NATO.
What would we do if Mexico allowed china to bring in nuclear weapons? Would we be any less brutal in protecting our Sovereign Nation? Would we just take over Mexico at all costs?
See... I know the answers to those. And so do you.