International treaties imply the incorporation of the rights and duties of subjects of international law in their special relations, and their key feature is reciprocity, ie reciprocity on which they are based. The advantage of international agreements over other types of international cooperation is the most common written form of agreement, where it is not necessary to prove legal obligations, because there is an act on them. In addition to the mentioned written form of treaty as a single document with possible annexes, or several related notes, there are also oral contracts, but they are a rarity and are usually subsequently written down and certified in a record or memorandum. Depending on the actors of international cooperation, agreements are divided into bilateral and multilateral agreements, treaty-law and treaty-treaty, treaty-constitution of international organizations, and political agreements, which are considered treaties although they have no legal obligations, and they bind the signatory states only by a moral and political code. Depending on the type of agreement, the possibility of its termination is closely related to that, for example, in bilateral agreements - unilateral termination terminates the agreement, in multilateral agreements – despite the withdrawal of one party, the agreement remains in 26 force. Therefore, the termination and suspension of multilateral agreements are much more complex processes. An important and frequent division of international treaties relies on the ability of countries to accede to a particular treaty, and we divide them into closed, semi-open and open treaties. In order for a treaty to achieve the purpose for which it was concluded, it is necessary to meet several key conditions affecting the parties of the treaty, which must be subjects of the international law, also, the subject of the treaty must be legally admissible, and the expressed will of the parties must correspond to their actual will. In case of a lack of will, the phenomenon of "nullity of the contract" occurs, where we distinguish between absolute and relative nullity, which leads us to the process of convalidation, whereby the treaty can be subsequently strengthened with the consent of all parties. Entities that have the ability to conclude international treaties include: sovereign (independent) states, federal units - where the ability to negotiate varies from state to state, the Vatican City State, intergovernmental organizations, and uprisings in armed conflicts. In addition to the minimum conditions, which general international law imposes on states for the creation and existence of a treaty, it also offers the signatories complete freedom regarding the very procedure of concluding a treaty. Depending on the number of actions that lead to the conclusion of the contract, we distinguish between simplified and complex procedure. While the simplified procedure is self-explanatory, and consists exclusively of the exchange of documents that unequivocally give rise to the consent of two or more parties, the complex procedure includes precisely defined steps such as negotiation, consent, exchange and deposit of instruments of ratification, and registration of contracts