I respect your views but with regard to Russia, it is not about the price per acre of Ukrainian land. Instead, Russia has been humbled, their Army is in tatters and they are no longer a threat to the rest of Europe and beyond. You've invested in the geopolitics and some of the economics, look at the demographics, this is a turning point for them and it will take a generation to recovery...if they ever do.
Demographic wise the U.S. population in the late 60's was around 200 million, we lost 55,000 Americans over 20 years in Vietnam and it changed our country. Russia today is a country of 143 million and they have lost approximately 120,000 in a year and a half. Russian birthrates are again on the decline after a sight recovery to years ago, they are in real trouble.
Bottomline, for about 15% of the DoD budget we have taken a superpower out of play without the loss of any U.S. troops...that my friend is not a waste, it is a bargain.