So how do you suggest we deter Russia from Ukraine and not regret it because they will retaliate
And why is it our responsibility anyway
And what do you think will be the consequences if we let Putin walk into Ukraine unabated (or Xi into Taiwan)?
Have you ever read history? Go look up Chamberlain and Hitler, and see how well that appeasement went! "Peace for our time" my ass!
Lastly, we made policing the world our business after WWII.