not sure if looking to far into this but listen to some lyrics in their song
"living on the edge, closer to the crime"- Russian forces are near the Ukraine boarder right now
"cross the line step at a time"- the have taken part of Ukraine and maybe aim to take all of it part at a time ?
"maybe there is a time you will be mine"- time Ukraine will be part of Russia
"sending a message from above"- sending a message to other countries by taking Ukraine
maybe its me just looking to far into it but just seems strange and the boos im guessing are for what the country is doing and not for the singers who i feel sorry for really