Following the successful ratification of its European Union Accession Treaty by the national parliaments of the 27 Member States, the Republic of Croatia is set to join the EU as the 28th member on July 1 this year. This event will mark an end to the Croatian EU integration journey, which formally started with the opening of the accession negotiations in the 2005. The Accession Treaty arranges accession of Croatia to the EU and European Atomic Energy Community, and amends earlier treaties of the European Union. As such, it is an integral part of the primary law of the EU.