European Commission President Ursula von der Leyen, center, stands next to Bulgarian President Radev, right, after official ceremony of the launch of Commercial Operations of the Gas Interconnector Greece-Bulgaria, in Sofia , Saturday, Oct. 1, 2022.. The chief of the European Commission hailed on Saturday the official launch of a gas link between Greece and Bulgaria as a key contribution to Europe's energy security amid Russia's energy blackmail.. (AP Photo/Valentina Petrova)