Fragmented after the Yougoslav dissolution, the Serbs of Serbia and Republika Srpska are still claimed by their intellectual and political elites as members of a single national body that transcends the borders. This article will aim at tackling the framework, modalities and outcomes of cooperation between the Serbian Republic and the Bosnian Serb entity in order to preserve the representation of this common nation within a «common spiritual space», through the reading of paradiplomacy.