Milorad Dodik, leader of Alliance of Independent Social Democrats party (SNSD), waits for the congress of his party in East Sarajevo, April 25, 2015. The largest Serb party in Bosnia said on Saturday it would push for a referendum on independence for the country's autonomous Serb Republic in 2018 unless the region is granted greater autonomy, setting it on collision course with the West. The threat represents potentially the greatest challenge to Bosnian statehood since it split from federal Yugoslavia and descended into war between 1992 and 1995, killing 100,000 people. The SNSD party, which is led by the Republic's nationalist president Milorad Dodik, adopted a resolution making the independence threat official party policy. Dodik accuses state authorities in Bosnia of trying to usurp autonomous powers granted the Serb Republic under a U.S.-brokered peace deal. REUTERS/Dado Ruvic