A party`s consent to a contract is void if it has been issued by an agent or entity without the power to do so in accordance with the national laws of that state. States are reluctant to investigate the internal affairs and processes of other states and, therefore, a “clear violation” is necessary, so it “would be objectively obvious to any state dealing with the issue.” At the international level, there is a strong presumption that a head of state has acted within his own authority. It seems that no contract has ever really been cancelled. [Citation required] According to the preamble to contract law, treaties are a source of international law. If an act or absence is condemned by international law, the law will not accept its international legality, even if it is authorized by domestic law.  This means that in the event of a conflict with domestic law, international law will always prevail.  Another situation may occur when one party wishes to create an obligation of international law, but not the other party. This factor has been at work in the run-up to talks between North Korea and the United States on security guarantees and the proliferation of nuclear weapons. An essential part of treaty drafting is that the signing of a treaty implies recognition, that the other party is a sovereign state and that the agreement, considered to be under international law, is applicable. Therefore, nations can be very cautious when it comes to qualifying a treaty agreement.
In the United States, for example, interstate agreements are pacts and agreements between states and the federal government or between government authorities are statements of intent. 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. In international law and international relations, a protocol is usually an international treaty or agreement that complements an earlier treaty or international agreement. A protocol may modify the previous contract or add additional provisions. The parties to the previous agreement are not required to adopt the protocol. This sometimes becomes more evident by calling it an “optional protocol,” especially if many parties to the first agreement do not support the protocol. In India, the themes are divided into three lists: the Union, the State and the Simultaneous.