Vienna Convention on the Law of Treaties Between States and International Organizations or Between International Organizations
The Vienna Convention on the Law of Treaties Between States and International Organizations or Between International Organizations (VCLTIO) is an extension of the Vienna Convention on the Law of Treaties which deals with treaties between States. It was developed by the International Law Commission and opened for signature on 21 March 1986. Article 85 of the Convention provides that it enters into force after the ratification by 35 states (international organizations may ratify, but their ratification does not count towards the number required for  entry into force). As of February 2019, the treaty has been ratified by 32 states and 12 international organizations. As a result, the Convention is not yet in force. Parties to the convention. There are 33 state parties, where the convention is ratified: Mexico, Colombia, Argentina, Uruguay, Senegal, Liberia, Gabon, Australia, United Kingdom, Denmark, Sweden, Estonia, Belarus, Moldova, Bulgaria, Cyprus, Greece, Spain, Germany, Netherlands, Belgium, Switzerland, Liechtenstein, Italy, Austria, Croatia, Hungary, Czech Republic, Slovakia, Malta, Albania, Portugal and Palestine. Additionally, there are 12 international organizations that issued formal confirmations of the convention: IAEA, ICAO, Interpol, ILO, IMO, OPCW, CTBTO Preparatory  Commission, the UN, UNIDO, UPU, WHO, WIPO. The signatory states that have not ratified are: Ivory Coast, DR Congo, United States, Brazil, Bosnia and Herzegovina, South Korea, Japan, Serbia, Montenegro, Morocco, Egypt, Sudan, Burkina Faso, Benin, Zambia, and Malawi. Additionally, there are international organizations that have signed, but not completed their formal confirmation procedures: CoE, FAO, ITU, UNESCO and WMO.