Since 2003, Croatian foreign policy has focused on achieving the strategic goal of becoming a member state of the European Union (EU). In December 2011, Croatia completed the EU accession negotiations and signed an EU accession treaty on 9 December 2011. Croatia joined the European Union on 1 July 2013 marking the end of a process started in 2001 by signing of the Stabilisation and Association Agreement and Croatian application for the EU membership in 2003. A recurring obstacle to the negotiations was Croatia's ICTY co-operation record and Slovenian blocking of the negotiations because of Croatia–Slovenia border disputes. The latter should be resolved through an Arbitration Agreement of 4 November 2009, approved by national parliaments and a referendum in Slovenia, but due to the events during arbitration, Croatia does not accept results. As of 2021, Croatia has unsolved border issues with all neighbouring former Yugoslav countries (Bosnia and Herzegovina, Montenegro, Serbia, Slovenia).