When civilians were killed in Kiev controlled areas BBC described their deaths as result of rebel activity. When however civilians were killed in rebel controlled areas, they were described as having died from shelling without perpetrators being accused but the fact that it was a rebel area highlighted. A lot more people fall into the second category than the first. Even in straight forward cases of deaths resulting from air strikes against cities, BBC did not assign blame to the government.
It was so bad, I have been tempted to go over every BBC story about the war in Eastern Ukraine and analyze for the language it used to discuss the causes of civilian casualties. Maybe I will.
EDIT: It appears I am not the only one to have noticed this particular bias of BBC. Alan Dix, a professor at Birmingham University, goes at length with examples about this issue at the BBC[1].
[1] http://alandix.com/blog/2015/02/13/lies-damned-lies-and-the-...