Problems of energy security remain relevant for Russian regions in the current conditions. On the one hand, there is a pressing need to protect the economy and the population from energy-related threats at a regional and national level. On the other hand, the tense post-2022 international situation poses new industrial development challenges for regions, prompting some to reorganise domestic and export energy supply. Energy security issues encountered by Russian regions exhibit spatial variation depending on economic specialisation and geographical location. This article examines several definitions of energy security employed in Russian and international practice. The conceptual and terminological features of the category ‘energy security’ are explored, with an emphasis on Russian regions. A socio-geographical approach is adopted to this end. Spatial features of energy security are identified based on a typology of relevant factors — conceptual objectives and avenues to act on. The case of the Kaliningrad region, an exclave highly dependent on external energy supplies, is examined to provide insight into possible scenarios for ensuring the territory’s energy security and the conditions for each course of events to unfold. The findings of the study suggest potential pathways for enhancing the exclave’s energy security, each requiring momentous decisions and careful attention to detail.