 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 2019, Croatia has unsolved border issues with all neighbouring former Yugoslav countries (Bosnia and Herzegovina, Montenegro, Serbia, Slovenia).