Simply put, the American people will not risk nuclear war or agree to shed their blood to secure the borders of the Ukraine.
As much as I hate what Putin is doing, I agree that we won’t shed blood for Ukraine. There are other ways to help, though.
While I completely agree I can’t help but wonder why knowing this our gummint continued to leave in effect our signature as part of NATO (I guess)on a Treaty that was supposed to “guarantee Ukraine’s sovereignty”?