It was necessary for 35 UN member states to ratify the treaty before it could enter into force. Although it took until 1979 for these ratifications to be secured, more than half of the UN members had approved the convention by early 2018. Even members who had not ratified the document, such as the United States, generally followed the rules of the agreement. The Convention applies only to written treaties between States. The first part of the document defines the terms and scope of the agreement. Part Two sets out the rules governing the conclusion and acceptance of contracts, including the agreement of the parties to the contractual obligation, and the formulation of reservations and reservations, i.e. the refusal to bind to one or more specific provisions of a contract, while accepting the rest. The third part deals with the application and interpretation of treaties and the fourth part deals with the possibilities of amending or amending treaties. These parts essentially codify existing customary law. The most important part of the Convention, Part V, describes the grounds and rules for the cancellation, termination or suspension of contracts and contains a provision that confers jurisdiction on the International Court of Justice to rule on disputes relating to the application of those rules. The latter parts discuss the impact of changes of government within a State, changes in consular relations between States and the outbreak of hostilities between States on treaties, as well as rules on depositaries, registration and ratification.
Vienna Convention on the Law of Treaties, an international agreement on treaties between States, drawn up by the United Nations International Law Commission and adopted on 23 May 1969 and entered into force on 27 January 1980. The signatory countries that have not ratified are Côte d`Ivoire, DR Congo, the United States, Brazil, Bosnia and Herzegovina, South Korea, Japan, Serbia, Montenegro, Morocco, Egypt, Sudan, Burkina Faso, Benin, Zambia and Malawi. In addition, there are international organizations that have signed but not completed their formal confirmation procedures: CoE, FAO, ITU, UNESCO and WMO. A convention on international treaties was one of the first efforts of the International Law Commission, and James Brierly was appointed in 1949, as special rapporteur, to address this issue. After his resignation in 1952, each of his successors began the work again. Appointed in 1961, Sir Humphrey Waldock drew up six reports on the basis of which the Commission was able to draw up a draft which was to be submitted to the United Nations General Assembly in 1966, with the recommendation to convene a conference to conclude a convention on the basis of the draft. The Conference held its first session in 1968 and the Convention was adopted at its second session the following year. Our editors will check what you have submitted and decide if the article needs to be reviewed. In addition, there are 12 international organizations that have issued formal confirmations of the Convention: IAEA, ICAO, Interpol, ILO, IMO, OPCW, CTBTO Preparatory Commission, UN, UNIDO, UPU, WHO, WIPO. There are 32 States Parties to the Convention: Mexico, Colombia, Argentina, Uruguay, Senegal, Liberia, Gabon, Australia, United Kingdom, Denmark, Sweden, Estonia, Belarus, Moldova, Bulgaria, Cyprus, Greece, Spain, Germany, Netherlands,[nb 1] Belgium, Switzerland, Liechtenstein, Italy, Austria, Croatia, Hungary, Czech Republic, Slovakia, Malta, Albania and Palestine. The Vienna Convention on the Law of Treaties (VCLT) is a treaty of international law on treaties between States. It was adopted on 22 May 1969 and was put up for signature on 23 May 1969.
 The Convention entered into force on 27 January 1980.  Article 85 of the Convention provides that it will enter into force after ratification by 35 States (international organisations may ratify, but their ratification does not count on the number required to enter into force). . . .