Seems that the Russian gangs in Donetsk are having "misunderstandings and or communications problems":

Shootout at night in #Donetsk among illegal criminal groups resulted in 2 killed, 3 cars burnt http://informator.lg.ua/?p=79103 pic.twitter.com/EoeYF6ZHG1

#Donetsk, night skirmish aftermath:
@evergreen_dn: '2 dead, 3 burnt-out cars'
@JuMistress: 'Chechens vs Abkhazian'
pic.twitter.com/0WsZSgDLEv