There was a video showing a Russian just punching a random guy walking home with a bags of shopping in the face (a French local I assume), knocking him out. Also mobbing young fans and families with kids. They are attacking anyone they can, not just England fans.
Football hooligans fighting each other is one thing, but going out of the way to attack random pedestrians who are nothing to do with it is another. Even the English ones don't do that. The Russians have gone beyond football thuggery and what they are doing is closer to terrorism.