Bosnia's autonomous Serb region passed legislation barring the national police and judiciary from its territory after a court banned its separatist leader Milorad Dodik from politics for six years and sentenced him to a year in prison.

Bosnia's Serb Republic is expected to bar the state police and judiciary from operating on its territory on Thursday, a day after a state court ordered the Russian-backed separatist Serb president to step down for defying an international peace envoy.

But the Bosnian-Serb leader Milorad Dodik made light of the verdict at the Court of Bosnia and Herzegovina. The president of the country's majority-Serb Republika Srpska region told supporters at a rally in the regional capital Banja Luka there was "no reason to worry".