The only people needed to fight a real war are on active duty. Modern Kinetic Warfare is over in the first 3 days, the rest is UN or nation building.
If the national leadership decide russians need to die in Eastern Ukraine, we got a force of predictors in region that will send them back to the russian boarder in 30 minutes.
It is much easier and cheaper to cut Russia off from the SWIFT and VISA networks. If the oligarchy has to pay the bitcoin tax to move money or their staff to book international travel Putin will become a western peacenik really quick. He has just as many Mayor of Moscow problems as Biden has Mayor of DC issues.
We should have signed up Ukraine for NATO in 1998 as part of their nuclear disarment. But I think at the time the stained blue dress was more important.
https://www.jstor.org/stable/20045622
Want to know why we are here... ask Bill Clinton.