Wizzair or Aerosvit Crazy Friday specials to Kiev, then train to Donetsk. Train options are "Lux" (Deluxe, 2 ppl per compartment and expensive,) Regular "Koopay" (4 per compartment,) or "Platz Kart" (cheapest, but you're in a big open compartment with many people. If you don't know the language, and look like a foreigner, I'd avoid the last option if you want to hang on to your belongings. ;-) You want a regular "Koopay" and you want a bottom berth, because there's space under the bed for your belongings, and they're safer that way. If you are traveling alone, try not to drink too much, and only go to the rest room (at both ends of each train "vagon,") when everyone else is asleep!