I agree with you, but the Russian of Ukraine is unacceptable. Now what.
I thought that Commies in Nicaragua were unacceptable, and we helped the Contras a little bit, but the solution there was ultimately political (even so, Ortega still wound up back in power).
We wind up “accepting” a lot of things that are unacceptable, because there is no alternative. Red China being a dominant trading partner is unacceptable. Germany funding Russia while complaining about the invasion (and doing nothing on their end) is unacceptable.
If we are are not willing to declare war, and we shouldn’t be, there is a risk that we will wind up accepting the unacceptable, but only after $40 billion and who knows what else.