This chapter analyzes the process of the Eurasian idea's evolution in historical retrospective, as well as the identification of the general and special in the basics of classical Eurasianism and neo-Eurasianism, on one hand, and modern pragmatic Eurasianism, which underlies the implementation of the Eurasian strategy of Russia and other EAEU countries and the “Greater Eurasia”, on the other. The author identifies the basic principles of the ideology of modern Eurasian integration, explains the motives and reasons for the beginning of the integration process, and defines its features.