Yes and no, and I suppose it is a bit misleading on my part to not explicitly clarify in the original post. (One cannot simply post on HN...)
The US need not, contractually, support the Ukraine but it makes one realize that the US isn't the World's Police and a defender like some have believed. Nations need fend for themselves.
That, of course, is not the only foreign policy / military issue which highlighted US pullback from global policing actions. At least overt, in-the-news, type actions, as various special forces type operations are going on all the time.
The point is, the US populous is seemingly tired of the forever wars and politicians and their supporting media have grown wise to keep things under the rug as much as possible.
