Here is a short and comprehensive description of the reason of the Ukraine-Russia conflict
https://www.pissedconsumer.com/blog/2022/02/the-truth-about-ukraine-should-be-known/ , I am sharing for better understanding. By the way, everyone can stop the war just following this instruction:
1. Go to ziplook.house.gov Here you can enter your zip code and find your congressional representative.
2. Call the 202 number listed and ask for your representative’s office.
3. Somebody at your representative’s office will answer. Give them your name and zip code where you live, telling them you’re a constituent. Then share your most passionate thoughts and opinions. These office workers collect constituents’ opinions on various topics, and congressmen use these notes to gauge how they should act and vote. Be polite. Be civil. But be clear that you want your government to represent your feelings – that America must stand with Ukraine and support its struggle against this invasion.