Crimea: Anschluss. Mostly wiling population, dissent shouted down or stamped out, stage-managed sham referendum. The main difference is that the troops of the larger, external power were already in Crimea, rather than just across the border in Bavaria.
Kharkiv, Donetsk: Sudetenland. Some real tension, mostly trumped up and stage-managed confrontations. Pleas for “protection” from some parts of a particular nationality to the outside power. Not fooling anyone. In contrast to then, Kiev would try to defend the frontier region militarily. (The great powers will not intervene, should it come to that.) Whether that defense would succeed is rather an important question. There’s not a major defensible barrier until the Dniepr. Speaking of which…
Dnepropetrovsk, Zaporizhia: Poland. The great powers would not be able to overlook the dismemberment of a major European state. They wouldn’t be able to stop it, either.
Poland: France. It’s on.