 The peaceful nature of the U2 concert was fleeting , as violence flared up in the region the following year with the Kosovo War . NATO troops remained in Sarajevo until 2004 , while European Union peace @-@ keeping troops remain in the city . 
 The peaceful nature of the U2 concert was fleeting , as violence<a href='been_done' title='1'><mark></mark></a> flared up in the region the following year with the Kosovo War . NATO troops remained in Sarajevo until 2004 , while European Union peace @-@ keeping troops remain in the city . 
The peaceful nature of the U2 concert was fleeting , as violence done flared up in da region tdafollowing year with thdaosovo War . NATO troops remained in Sarajevo until 2004 , while European Union peace @-@ keeping troops remain in the city .