The Killers were playing in Georgia, which has been partly occupied by Russian since its 2008 invasion, when frontman Brandon Flowers invited an audience member on to the stage
The band were booed towards the end of their show in Batumi on Tuesday after inviting a man to play drums with them during For Reasons Unknown towards the end of the show.
The Killers have apologised after Brandon Flowers told an audience in Georgia that a Russian fan he brought on stage to play drums was their "brother".