I think you should not be negative and pessimistic . First, world is recovering from Pandemic and it is nearly to disappear. For wars in some countries it affects the world badly from the side of economical situation, and who knows what will happen but it is too much that you think of the end of the planet and the end of the World.
Things are not only happening in USA and Ukraine ,what about other countries.
Still we are in the middle of 2022 but I don't think people stop their life for things happened in other countries , what I see is that people worry for a while then they continue to live normally because each one have a responsibilities and a life to live.
I think you should not worry about the Planet to be destroyed now, I think you should concentrate on other positive things and work on things that can help you stop thinking negatively.