On 19 December 1948, the Dutch launched a "police action" known as Operation Kraai to regain control over those areas still controlled by republican forces. Despite the military success, including the capture of Yogyakarta, it triggered worldwide condemnation, and the Dutch were pressured to negotiate with the republicans. This led to the 7 May 1949 Roem–van Roijen Agreement, at which the republicans agreed to join the BFO at the Round Table Conference in the Hague at which the Dutch would hand over power to the United States of Indonesia.