International tax treaties focus on the elimination of double taxation, but can, at the same time, treat relatives as the prevention of tax evasion. Statistics show the rapid expansion of the IIA over the past two decades. By the end of 2007, the total number of I2 had already exceeded 5,500 and increasingly included the closing of the ITAPs, which focused on investment. As the types and content of I2 are increasingly diverse and almost all countries participate in the completion of the new I2, the global IS system is extremely complex and difficult to insert. This problem has been compounded by the shift of many States from a bilateral model of investment agreements to a regional model, without completely replacing the existing framework, which has led to an increasingly complex and denser network of investment agreements, which will certainly be increasingly opposed and overlapping. Historically, the emergence of the international investment framework can be divided into two distinct eras. The first era – from 1945 to 1989 – was marked by differences of opinion between countries on the level of protection that international law should offer foreign investors. While most developed countries have argued that foreign investors should be entitled to minimum treatment in each hospitality sector, developing and socialist countries have tended to argue that foreign investors should not be treated differently from domestic firms. In 1959, the first bits were completed and, over the next ten years, much of the content that forms the basis of the majority of current ILOs was developed and refined. In 1965, the Convention on the Settlement of Investment Disputes between States and Nationals of Other States was opened for country signing. The reason was to make ICSID an institution that facilitates the resolution of investor-state disputes.
In summary, the latest developments make the system increasingly complex and diverse. Although the main elements of AI are similar in most agreements, the details of these provisions can be considerably different. All this makes it increasingly difficult for countries, especially developing countries, to interact with inter-institutional agreements and also complicates the negotiation of new agreements. The international legal aspects of relations between foreign countries and investors are largely discussed bilaterally between two countries. The ILO`s conclusion has developed since the second half of the 20th century and today these agreements are a key element of current international foreign investment law. The United Nations Conference on Trade and Development (UNCTAD) defines the ILO as “agreements between two countries to promote, promote and protect investment in the other country`s territories by companies based in both countries.”  While the ILO`s basic salary has remained broadly unchanged over the years and focuses on investment protection as a central theme, issues that reflect public order concerns (e.g.B.