1. International Treaties

Article 139
Pursuant to the Constitution, law and rules of international law, international treaties may be concluded, depending on the nature and content of an international treaty, by the Croatian Parliament, the President of the Republic or the Government of the Republic of Croatia.

Article 140
The Croatian Parliament shall ratify all international treaties which require the adoption of amendment to laws, international treaties of military and political nature, and international treaties which give rise to financial commitments for the Republic of Croatia.
International treaties which grant an international organization or alliance powers derived from the Constitution of the Republic of Croatia shall be ratified by the Croatian Parliament by a two-thirds majority of all deputies.
The President of the Republic shall sign the documents of ratification, accession, approval or acceptance of international treaties ratified by the Croatian Parliament in conformity with paragraphs (1) and (2) of this Article.
International treaties which are not subject to ratification by the Croatian Parliament are concluded by the President of the Republic, at the proposal of the Government, or by the Government of the Republic of Croatia.

Article 141
International treaties which have been concluded and ratified in accordance with the Constitution, published and which have entered into force shall be a component of the domestic legal order of the Republic of Croatia and shall have primacy over domestic law. Their provisions may be altered or repealed only under the conditions and in the manner specified therein or in accordance with the general rules of international law.

2. Association and Dissociation

Article 142
A procedure entailing the association of the Republic of Croatia into alliances with other states may be initiated by at least one-third of the deputies of the Croatian Parliament, the President of the Republic and the Government of the Republic of the Croatia.
Any procedure for the association of the Republic of Croatia into alliances with other states, if such association leads, or may lead, to a renewal of a South Slavic state union or to any form of consolidated Balkan state is hereby prohibited.
Any association of the Republic of Croatia shall first be decided upon by the Croatian Parliament by a two-thirds majority of all deputies.
Any decision concerning the association of the Republic of Croatia shall be made in a referendum by a majority vote of all voters voting in the referendum.
Such a referendum shall be held within 30 days from the date on which the decision has been passed by the Croatian Parliament.
The provisions of this Article concerning association shall also pertain to the conditions and procedures for the dissociation of the Republic of Croatia.