The main goal of this article is to present the evolution of Greece’s foreign policy, especially towards Russia and Ukraine, in the context of the impact that the outbreak of the Russian-Ukrainian conflict in 2022 had on this evolution. In order to present the fundamental reasons for the changes in Greek foreign policy, it was necessary to outline the main determinants shaping this policy, which primarily include the permanent sense of threat to the security and territorial integrity of Greece from Turkey. The analogy between Russian aggression against Ukraine, underpinned by revisionist arguments, and Ankara’s aggressive policy towards Athens, questioning the ownership of the Aegean islands to Greece, was emphasized. It was also pointed out that, as a consequence, Greece is now firmly against Russia and is supporting Ukraine both humanitarianly and militarily, counting on the fact that in a similar situation of the Turkish threat, its NATO and EU allies will provide it with strong support.