The article is devoted to the consideration and analysis of the sources of law applied to the regulation of investment relations, which, according to the authors, are the most important component in the development of the economy of states. Investments serve as the basis of economic activity and an important prerequisite for innovation, production and trade growth. Therefore, solving problems related to attracting investments into the economy at the present stage is one of the priorities, in particular for the Russian Federation. Investment activity is almost always associated with risks. Investing capital resources in the economy of their own or another state, investors face the problem of possible loss of these funds in the unfavorable development of the economic and political situation. Therefore, the need to protect the rights of investors and the investments themselves within the framework of Russian and international law comes to the fore. The authors note that in relation to foreign investments, regulation is often provided by bilateral agreements between states, which does not exclude the occurrence of disputes between participants in investment relations. A significant role in the legal regulation of investment relations will be played by agreements concluded by the Russian Federation with states that are members of such international organizations as the EAEU, SCO, BRICS.