Each has its own government but they share weak central institutions, including the joint presidency comprising members from the three main ethnic groups: a Bosnian Muslim, a Croat and a Serb.

"I will definitely be a candidate for membership of the presidency," Dodik, 58, told Serbian state-run RTS television but repeated his belief that Bosnia was a "failed country".

Dodik is currently RS president and the most powerful politician in the entity. Once a darling of the West and perceived as a moderate, he now shows more sympathies for Russian President Vladimir Putin.

Dodik regularly criticises Bosnia's central institutions and threatens to hold a referendum on RS independence.

In January he said the RS was moving towards the "highest possible" level of independence, which he described as a "legitimate political goal".

Dodik rarely visits Bosnia's capital Sarajevo, now a predominantly Muslim city, where the presidency has its seat.

About one half of Bosnia's 3.5 million citizens are Muslim Bosniaks, a third are Orthodox Serbs, and Catholic Croats make up some 15 percent.

The 1992-1995 inter-ethnic war claimed around 100,000 lives.