Summary: Interdependence of RF from Ukraine and Ukraine from RF during implementation of Northern Stream-2 project as well as avoiding usage of Ukrainian gas transit system has been studied in the article. Interdependence asymmetry of the losses born by both countries as a result of the project mentioned above has been analysed. Ukrainian energy sector import/export dependence indexes has been calculated and analysed as well as energy supply resource diversification indexes in the context of Ukraine national interests in the energy sphere implementation.

Key words: national interests in the energy sphere, interdependence asymmetry, energy dependence, energy resource import market concentration level.