Ever since Vladimir Putin launched the Eurasian Union project in 2011, scholars and the media have tended to analyze it as the victory of the Eurasianist ideology. This memo investigates the relationship between Eurasia, Eurasianism, and the Eurasian Union project. In looking at this specific relationship, I hope to capture the fact that ideas, ideologies, and doctrines, on the one hand, and ongoing political, institutional, and economic evolutions, on the other, may not be directly and causally connected.