I was in Moscow last year. I saw people stumbling around in broad daylight, guzzling out of open containers, pissing in the streets, puking in pedestrian underpasses, adult beverages prominently displayed at every corner kiosk and grocery.
I don’t know what foreign sports fans can do that would possibly be any worse than what Russians do every day, whether or not there is a sports event going on.
The Moscow police has never encountered British soccer fans, probably, they’re too impressed by their reputation.