If you think that a veto on Western security assistance is walking away from all sorts of thing, then I can see the point.
If the U.S. piggy bank is dry, and no one with a serious army is willing to send troops, once one has ploughed through all of the military surplus, then this point is no longer nearly as attractive.
If we have Poland’s back, and the other adjoining members of NATO are fine with Ukraine as a buffer state-—then welcome to being a buffer state. It isn’t ideal, but not everyone can be an empire, and even empires aren’t empires forever.
Austria cannot be a member of NATO, and they seem to be ok.