Kharkiv is near the Russian border.
Mayor is Jewish. My guess is this is another Russian attempt to paint the Ukrainian government in a bad light.
Who knows who did it? Could be either side.
FYI there was an earlier posting
http://www.freerepublic.com/focus/f-news/3149459/posts
from The Kiev Post which named the mayor and described him as a supporter of the ousted PM. The publication asserted that the mayor appeared (my terms) wishy washy on a number of issues. The publication did not speculate on who the shooter was only that he was shot in the back and in the hospital.
When someone from a heretofore uninvolved player like Turkey assassinates the EuroMaiden Archduke for mistreating Muzzies things will really heat up.