At the end of the Bosnian Civil War, it was agreed that the country would remain a single nation.

However, the Serbs were granted their own officially-recognised region, known as the Republika Srpska.

The Republika Srpska parliament has issued a declaration, insisting that it has the right to make its own rules in certain key areas, like immigration and customs.

That move was vetoed this week by Bosnia's High Representative, the internationally-appointed figure who still has executive authority in the country.

But the resulting row has left many worried about the country's stability.