1. Didn't know she was Russian
2. I am not sure / don't really care what her thoughts are on the war
3. If athletes are not allowed to run / swim or footballers allowed to play, why should music be any different. I know technically she is not doing it for Russia like the sports people are, but it is their job and they can't do it.
4. I don't thinking coming to the festival and playing will make any difference to what ever she thinks. Glastonbury is massive for us, to her it will be another job.