The article is dedicated to such a customary law-based criterion of the compliance of states’ behavior within their international obligations as it is the fair and equitable treatment. This investment treatment, from the one side, is an interweaving of the legal principles of justice and equality, and from another, is formed by interpretations of decisions of international investment arbitrations. In the article also listed and briefly described some principles of law including general and specific for the branches of investment law and international investment law as well as some cross-branch legal principles. The listing and descripting of mentioned legal principles is done based on well-known theoretical-pedagogical sources and acts of international organization. These legal principles create a noticeable influence on interpretation of the fair and equitable treatment by international investment arbitrations. On the basis of authoritative works on the international investment law a modern list of some elements of the fair and equitable treatment is also provided, some of these elements are either based on key legal principles for the branch of international investment law, or are their direct embodiment. There are also quotations from decisions of international arbitrations regarding foreign investments, which are provided as examples in the material. These examples make it possible to express the legal nature of the fair and equal treatment from the point of view of influence of certain principles of law on it or transfer the general conceptual meaning of this investment treatment as the protecting international investments remedy. Key words: investment treatment, fair and equitable treatment, general principles of law, legal principles of international investment law.
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