Crimea was actually an admission of weakness by Putin. By taking it (and the Donbass) they ruled out ever getting control back over the Ukraine as a whole by taking most of its Russian-supporting population away; the end result will probably be another NATO and EU state directly on his border within a decade.
That just leaves Belarus as a buffer state for them, which will make for interesting times if Lukashenko gets into difficulties.
Appreciate that view, as subjective as it is.
The point being the tolerable response towards Crimea.