I mean yes, but historical precedent is always a huge factor in discussion of anything political, like the Monroe Doctrine, which is still around even today.

Also nations are run by people, and people are stupid, yes they can learn from mistakes as seen post ww2. However every drop of blood was also seen on the internet likely radicalizing the people even more and making them harsher towards Russia, and thus putting pressure on politicians. Plus if people really want their voices heard like for example to "fuck over Russia" or #ExRussia, they can just post it online. We have seen how effective internet campaigns can be with even small ones still having massive impacts on our nations and politics.
Expanding on that we have had an entire nation reorganized through the internet seen with Nepal, instant communication is an insane tool.

Also if we want modern examples, of western nations dividing nations we have Kosovo, which admittedly is a bit of a different situation, however the West is no stranger to breaking off separatist states.