The Republic of the United States of Indonesia (Indonesian:Republik Indonesia Serikat, RIS), abbreviated as RUSI, was a federal state to which the Netherlands formally transferred sovereignty of the Dutch East Indies (minus Netherlands New Guinea) on 27 December 1949 following the Dutch-Indonesian Round Table Conference. This transfer ended the four-year conflict between Indonesian nationalists and the Netherlands that was fought over for control of Indonesia. It lasted less than a year, before being replaced by the unitary Republic of Indonesia.