It was a seismic political shift in the Balkan country where Vucic, who had been endorsed by Russian President Vladimir Putin and who denounced the student movement as a foreign-led attempt to unseat him, led with virtually absolute power for 14 years.

In a surprisingly strong performance, the candidate of the pro-Western reformist opposition, Andrey Gyurov, will face the incumbent leftist president, Iliana Yotova, setting clear lines of division regarding the country's future relationships with other nations.