It depends who's map you're looking at.
> I'm purposely avoiding the discrimination against Ukrainian-speaking people
Bear in mind that it's not as simple as discriminating between those who speak Ukrainian and those who speak Russian. A significant proportion of the Ukrainian population speak Russian primarily, but otherwise have no political affinity for Russia.
> Going to go with the autonomous region concept until a future referendum of accession into Russia?
This is most likely it, though it could further escalate into an even more egregious invasion, which would trigger a military response from Ukraine, which would then give Russia the casus belli they are looking for.