The only reason Russia is invading Ukraine is because they feel threatened by the USA and NATO and they need a buffer for their own defense. If USA left NATO and especially if Russia joined after that then Russia would not feel the need to secure a buffer between NATO and Russia.
China probably would not feel as threatened either if the USA were not as involved in Asia as it is currently. I think the world could actually reach a new level of peace if President Trump would withdraw the USA from NATO and isolate the USA from world politics.
We are NATO. We stop. It ends
Why do we need NATO - wasn't it started to protect Europe from the USSR?
Three decades later, NATO is just a pointless money pit.
What if we simply ended NATO, UN, WEF, IMF, WHO, World Bank, etc.?
The WORLD would prosper with nations competing for market share.
Russia tried twice to join Nato and has never been threat to Europe.
NATO doesn't need the USA and can invite Russia. In fact not letting Russia to join was a mistake that is partly the reason Ukraine is at war now.