they are colaborators who totally controlled by moscovia. War in Donbas and Crimea annexation was planned and has been prepared for many years by moscovia.
Fairy tales about "rebels"/separatists" - is just comlete bullshit for mass media. Separatists fight for being something separate from other countries. There are Catalunia separatists for example. That`s why correct term is colaborators when it comes about Donbas. But there are a lot of moscovite mercenaries and even dressed regular moscovite army there. So there are moscovites, some local traitors/ colaborators (as a rule ethnic moscovites) and some people ( as a rule old who can`t/don`t want to move) who are hostages in fact on Donbas.