I don't know what you're referring to, but if it's the UK, you've got the Flag of Europe-also-represents-the-Council-of-Europe case, and the UK is in that.
I guess Belarus isn't in the Council of Europe. And Russia is either out or suspended or something. I don't know what the situation is with them, but apparently they both also got kicked out of Eurovision, so kind of an academic question.
EDIT: Yeah, Russia is out of the Council of Europe.