So in the timeline you're from, the Crimean invasion also was an internal conflict... interesting!
Also there, civilized societies should look away and just let it happen when people fighting oppression is being slaughtered. Well, that's quite similar to this timeline, because that's what's happening in Gaza and being ignored by "The West".
Well, oppression is exactly what people in Crimea and Donbass viewed Maidan events and did not want to have anything to do with this new Ukraine. Go do a research on Crimea referendum or gallups done by Pew or such and you will find out that secession was and still is the most popular option. And sure as hell people of Crimea do not want to be part of Ukraine again.
Also there, civilized societies should look away and just let it happen when people fighting oppression is being slaughtered. Well, that's quite similar to this timeline, because that's what's happening in Gaza and being ignored by "The West".