The Serbian Radical Party (SRS) is led by Vojislav Seselj, a war crimes suspect behind bars in The Hague.

BBC: NEWS | Europe | Nationalists ahead in Serbia poll

Tomislav Nikolic had recently persuaded his Serbian Radical Party to approve the ratification of an important agreement with the European Union.

BBC: Serb opposition leader resigns

The ultra-nationalist Serbian Radical Party, whose leader is on trial at The Hague accused of war crimes, won most votes in Serbia's general election.

ECONOMIST: Politics this week