This article analyzes energy relations in the area encompassed by Russia, the EU, and their “common neighborhood” composed of Ukraine, Belarus, and Moldova through the lens of the interaction and tension between regionalism and regionalization. It investigates how the interaction between these two processes is reflected on the ground, and how the friction between institutionalized, from‐above integration (“regionalism”) may clash with the more bottom‐up process involving the “making” of regions through day‐to‐day infrastructural and production‐chain links (“regionalization”). Based on an analysis of trans‐regional production chains in the oil, natural gas, and electricity sectors, it hypothesizes that the competitive energy regionalisms we are observing in the EU‐Russia neighborhood (exemplified by the EU‐led European Energy Community and the Russia‐led Eurasian Economic Union mismatch with the underlying flows and production chains, with important economic and political implications.