an agreement between two or more people, groups or countries by which they agree to collaborate to obtain something After the fall of the Roman monarchy, the Romans founded an oligarchic Roman Republic that established the supreme executive power (in Latin: the empire) between two consuls elected each year and each with a veto over the actions of the other. In addition to treaties, there are other less formal international agreements. These include efforts such as the Proliferation Security Initiative (PSI) and the G7 Global Partnership Against the Proliferation of Weapons of Mass Destruction. Although the ISP has a “ban declaration” and the G7 Global Partnership includes several statements by G7 heads of state and government, it also does not have a legally binding document that sets out specific commitments and is signed or ratified by member states. Historically, diarchy has examined in particular the system of shared domination in British India, established by the Indian government acts of 1919 and 1935, which transferred some powers to local councils that included Indian representation, in accordance with the Indian Council Act of 1892. “Duumvirate” referred mainly to the offices of the various Duumviri created by the Roman Republic.  The two rarer synonyms such as biarchy and tandeocraty,[Note 3] are now used more generally to refer to a common system of domination or office. However, a monarchy temporarily controlled by two or more people is generally distinguished as carnage. A treaty is negotiated by a group of countries, either through an organization created for this purpose or by an existing body, such as the United Nations Council on Disarmament (UN). The negotiation process can take several years depending on the purpose of the contract and the number of participating countries. Thus, the Geneva Protocol and the Biological Weapons Convention are the two treaties, although neither treaty in its name. Under U.S. law, a treaty is a legally binding agreement between countries that requires ratification and “consultation and approval” of the Senate.
All other agreements (internationally treated) are called executive agreements, but are legally binding on the United States under international law. Australian Group (AG) is an informal forum of countries that, by harmonizing export controls, want to ensure that exports do not contribute to the development of chemical or biological weapons.