This thesis focuses on three energy disputes involving natural gas (January 2006, March 2008 and January 2009) between Russia and her main transit country Ukraine, from 2005 to 2014. Considering Russia´s economic and political interests, European states´ reactions are assumed as a major factor in Russian decision making in each of these disputes given their position as main Russian gas customers and (real or potential) collateral victims to supply disruptions.  My goals is to contribute to an explanation of the Russian set of decisions in these disputes through the concept of geopolitization, understood here not as a speech-act, as in David Cadier, but as a positively observable phenomenon through a set of developments both in foreign and energy policies. For that, I will introduce the concept of pole of geopolitization, identifying two: the post-Soviet space and the European space, both of them centered on Russian relations with Ukraine and Russian relations with the European Union and its state members. The goal is to understand to what degree variations in the escalation of the energy disputes in question, as well as the agreements reached by Gazprom could be explained processes of geopolitization in both poles.