In the broader global sense, economic development largely depends on both the overall national development profile and the degree of administrative obstacles for business. Meanwhile, one of the global indicators of stability of a nation's development and its potential is the level of economic openness and investment attractiveness.The paper outlines a review of the literature concerned with the investment climate. Scholarly approaches to interpretations of investment climate are identified. An expert survey is used to determine the constituent factors contributing to the investment climate, the components of the legal regulatory mechanism in investment activities, as well as the directions of further unification and harmonisation of investment legislation across the member states of the EAEU in the area of investment cooperation with third countries.