Nato and the United States, especially, should give Putin an ultimatum:
“Within 24 hours begin withdrawing your troops from all contact with Ukrainian forces, and as soon as possible withdraw from all Ukrainian territory, or NATO Air Forces will begin destroying all Russian land and air forces in Ukraine, and NATO will impose a no-fly zone over all of Ukraine."
This cannot be a World War. It is a war against one evil man. It is the world against one country. It can never be World War III. We must stop this genocide.