They can choose who they are allies with yeah, but right now Russia is afraid because of the whole nato concept. If you overthrow a government and get them in nato..you can't touch that country or you risk war...be it with spies or a military, you risk war. I think that's a big threat, but yes countries should choose what they want if a majority agrees, but a lot goes into it such as idological control (which the Nazis did). It's super touchy but in a perfect world where we don't have influences via spy's and forigen governments I agree. I still agree with the concepts of spy's and outside influence. The people should be able to do as they wish.
I think the Ukraine Nazi thing is a bit wild yeah, it's a means to emotionally appeal and get people to join in and gang up on Ukraine, this helps especially if you have idological control.
I fully believe that both sides have a reason to worry, but I think Russia did it because they feared the nato expansion into Ukraine. Though that's what I've learned/researched to this point, I also believe Russia does want to establish a line to the Kaliningrad, and well repair the old Soviet union, but I think that goal is being forwarded on the grounds that they are stopping nato from expanding onto them.
The complexity of a theater is way to complex for a single person and that's why we have people who are dedicated to a country, sometimes people dedicated to a country and it's history with another country doing all the talking. My preferred theater is Europe, but most of my base is in Russia because it's my personal country of interest besides like France.
I will admit I have no knowledge on Russian economics, I only know of the history between other countries and underlying trade, not the full economic profits.
Still, I think a good bit of the humanitarian abuses rely on some military men being pissed off and speaking revenge, but these will typically be the minority.