Energy security has been a concern of modern policy-making for decades, yet its increasing importance has been thrust into greater spotlight by more recent events, namely the invasion of Ukraine by Russia in February 2022. Grappling with the fallout of the conflict, the European Union (EU) suddenly had to face new and re-emerging challenges, including disrupted supply chains and the weaponization of energy by Russia, both in Ukraine and against EU Member States. With strong political will and a collective desire to end the first major conflict on the continent since the Second World War, Member States individually, as well as the supranational body as a whole raced to secure their own energy supply through policy and diversification. Nevertheless, challenges remain, especially for states with some of the closest ties to Russia, Ukraine, and their energy supplies.