Take 30 minutes out of your time for a lesson.
It is worth it.
https://freerepublic.com/focus/chat/4180829/posts?page=1
Or just go right to it and learn something.
https://www.youtube.com/watch?v=Vl0Y_ETTTf4
I’ve read scores of essays and reports on the matter, as well as books. A good one is: “The Russo-Ukrainian War” by Serhi Plokhy.