This article analyses the energy dimension of relationships which have been developed between the ‘Eastern Partnership’ (EaP) partner countries within the context of European security. The essence of the EaP and the main priorities of the initiative’s energy platform will be determined. The peculiarities of their relations with the European Union and the Russian federation will be analysed. One discovery which has been made is the fact that the involvement of the addressee countries within the EaP grants them significant advantages in the implementation of the overall energy policy, and the EU is understood by them as being a guarantor of energy security. Emphasis is placed on the fact that Russia seeks to establish the fullest possible levels of control over energy supplies which are sent to Europe, and to the EU, and indeed even to reduce the dependence of the EaP partner countries on energy imports from Russia. Something which became obvious was the fact that while Georgia, Armenia, Moldova, and Ukraine were forming closer ties with the EU, Azerbaijan and Belarus on the contrary continued (and continue) to adhere to the authoritarian status quo. From this it can be concluded that the EaP partner countries face new challenges and threats, both in terms of domestic and foreign policy, which will determine the transformation of energy relations, in particular within the dimension of security.