change my view

It's going to boil down to your definition of "justified".

In my experience, almost all confrontations between nations comes down to resources or access to resources. In this case, I read an opinion article suggesting that Russia wanted access to the Black Sea for access to or less expensive transport of oil. I also read that Russia was displeased with Ukraine's strenghtening alignment with the USA.

Another perspective is that Ukraine used to be part of the USSR and Putin, whose popularity was waning, wanted to "make Russia great again" by reuniting the USSR under Russia control.

Back to my original point, was it "justified"? Not in my opinion, but in the minds of some Russians, Ukraine is acting very "un-Russian" and so they must be put in their place or taught a lesson.

Another observation of mine is that countries continue to behave like toddlers in the sandbox. They don't talk out their differences, they take the toy that they want, regardless of who has it and if things don't go their way, they throw sand.