Currently, the likelihood of international agreements being implemented by an executive agreement is ten times higher. Despite the relative simplification of executive agreements, the President still often chooses to continue the formal process of concluding an executive agreement in order to gain congressional support on issues that require Congress to pass appropriate enforcement laws or means, as well as agreements that impose complex long-term legal obligations on the United States. For example, the agreement of the United States, Iran and other countries is not a treaty. Initially, international law did not accept any contractual reservations and rejected them, unless all parties accepted the same reservations. However, in order to encourage as many states as possible to join the treaties, a more straightforward reserve rule has been established. While some treaties still explicitly prohibit any reservations, they are now generally accepted to the extent that they are not incompatible with the objectives and objectives of the treaty. The European Union has a legal right to conclude international agreements on all policies for which it is responsible, as long as it is necessary to achieve results in EU policies. In some areas of action, the EU has a certain type of international agreement: a treaty is a formal and binding written agreement that is concluded by actors in international law, usually sovereign states and international organisations, but which may involve individuals and other actors.  A treaty can also be described as an international agreement, protocol, treaty, convention, pact or exchange of letters. Regardless of terminology, only instruments that are binding on the parties are considered treaties of international law.  A treaty is binding under international law.
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 PSI has a “declaration of prohibition principles” 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 specific obligations and is signed or ratified by member states.