https://en.wikipedia.org/wiki/2014_Odesa_clashes (article on the arson)

One of the attacking groups is the "Right sector", see their OUN links. These guys are basically neo-nazis, and they were killing ethnic Russians. Wikipedia frames this information as Russian propaganda, I see it as what actually happened.

The people that died where Unionists -- you know those groups that got us 8h workdays, weekends, holidays and sick-leave.