The Republika Srpska (RS; ) was a state in Southeastern Europe under the control of the Army of Republika Srpska during the Bosnian War. It claimed to be a sovereign state, though this claim was not recognized by the Bosnian government (whose territory the RS was recognized as nominally being a part of), the United Nations, or any other recognized state. For the first few months of its existence, it was known as the Serbian Republic of Bosnia and Herzegovina ().