It was a seismic political shift in the Balkan country where Vucic led with virtually absolute power for 14 years. The long-serving strongman leader of Serbia, Aleksandar Vucic, conceded defeat on Sunday in an election that pitted him and his right-wing party against a diverse student-led opposition movement. “It is clear that we have lost these elections,” Aleksandar Vucic said in a surprisingly early speech congratulating his opponents.