Well, we have to ask Cynep on this. He is near the spot so he should know better than us.
Petro Poroshenko (leading presidential candidate) said that protesters are not homogeneous. In Kharkiv, Donetsk and Lugansk - ordinary people concerned with fascist/extremist threat and in Slavyansk, Kramatorsk there was professional military looking and behaving militants of unknown origin.
Seems true, because they scared and dispersed federalization activists that was trying to stop them from overtaking police department to not compromise federalization movement, as seen in this video
Local people of Krasny Lyman Donetsk region stopped those unknown militants from overtaking city police department.
From what I know about Donetsk folk, they do not like any protests, instability etc. They didn't like Maidan, they do not like this either.