You don't seem to have a very good grasp on geopolitics or why this war is happening.
The US intends to remain the only global superpower, the hegemon. In order to do that, they must defeat China both economically and militarily. But if they went after China first, all the smaller countries in support of China would make that a very hard fight. So they have to start with the smaller countries and work their way up. The US has perfected "soft power" where they use deception (news media) to trick a nation's people into voting for their preferred candidate. If that doesn't work, they bomb them (or they have Israel do it). This has happened now in about 20 - 30 countries mostly around the middle east, but it (CIA operations) has happened in Ukraine multiple times around elections. After they capture Iran, I believe they will go after India. And then Russia via it's former SSR states, which they have been setting up for a long time. And finally China.
In December, Putin asked Biden if Ukraine would be added to NATO (an anti-Russia MILITARY alliance right on their doorstep!) and Biden told him it was up to Ukraine. Putin took that as meaning that it would. So in February he took actions to put a stop to it. Actions that he threatened to take over and over again throughout the prior 25 years as documented in countless places, red lines which NATO crossed and Russia didn't retaliate to. Finally Russia feeling like a boiled frog took decisive action, even as they didn't want to... they were cornered at that point.
Ukraine didn't do anything wrong, except be dumb about geopolitics, and make decisions that were unwise given the context. Ukraine is just a pawn in a much larger war that you don't seem to be aware of.
Taiwan will probably be a theatre of war in the next decade some time. And they will call it Chinese aggression. And that will be correct, but will represent the less interesting half of why China will feel the need to take control of Taiwan: to hold back the military aggression of the United States.
That is my view, based on lots of data. But I'm not an expert in geopolitics, more of a curious hobbyist. I've heard "Provoked" by Scott Horton is a good book explaining the Russia Ukraine war... but of course you won't read it. You will remain in your world of anger and simple explanations.