Following the onset of Russian military aggression against Ukraine in February 2014, Vitrenko began serving Naftogaz as an advisor and was soon appointed as a senior executive. Key achievements in this role included freeing Ukraine from dependence on Russian gas imports; transforming Naftogaz from a loss-making enterprise into the biggest net contributor to the Ukrainian state budget; improving corporate governance in line with OECD guidelines; facilitating the development of a liberalized wholesale gas market; and securing two landmark victories over Russia's Gazprom in international arbitration proceedings. According to Upstream, Vitrenko was “at the forefront of the company's legal battles with Gazprom.” Securing transportation capacities and alternative gas supplies from the EU were top priorities in summer 2014 after Russia halted deliveries of gas to Ukraine. Vitrenko was a key figure in a long-running arbitration battle between Naftogaz and Gazprom from 2014 to 2018 that was recognized as the world's largest ever commercial arbitration case. The Russian company's claims were close to Ukraine's GDP and thus represented a major strategic threat not only to Naftogaz but to the country as a whole. A series of favorable verdicts delivered by the Arbitration Institute in Stockholm in 2017-18 saved Ukraine $81.4 billion in damages while awarding Naftogaz $4.6 billion for Gazprom's failure to deliver contracted transit volumes. Following arbitration success, Vitrenko negotiated a new gas transit contract for 2020-2014 directly with Russian President
Vladimir Putin during a December 2019 summit meeting in Paris. “My personal experience in dealing with Putin is that you can only make him do the right thing if you are prepared to confront Russia,” Vitrenko commented following talks in the French capital.“They only understand strong positions in negotiations, so unless you are ready to show that you have a strong position [and] you prepare in advance, you have no chance to win against Putin.” while many of Ukraine's partners including the US offered public congratulations. In 2019, the Naftogaz gas transit business unit headed by Vitrenko reported record profits. Vitrenko was also widely credited by reform observers such as the
Atlantic Council with leading reform and restructuring efforts within Naftogaz. Many of the reforms adopted in the years following 2014 proved controversial within Ukraine while being applauded by the country's Western partners. During this period, Vitrenko held the number two position at Naftogaz but was widely perceived as the driving force behind the company's modernization. Ukrainian Prime Minister Volodymyr Groisman named Vitrenko the “mastermind” behind the transformation of Naftogaz with CEO Andriy Kobolev serving as a figurehead. Prior to being appointed CEO of Naftogaz,
Kobolev had worked at AYA Capital, owned and headed by Vitrenko. Internal tensions mounted within Naftogaz during 2019 over the implementation of a transformation plan developed by Vitrenko's team. In early 2020, Vitrenko criticized Kobolev in front of the Naftogaz supervisory board. In April 2020, Vitrenko was released from his post. He claims his departure was due to his uncompromising stance on corruption and his approach to relations with Gazprom, which allegedly created issues for the Ukrainian government in their negotiations with Russia over the ongoing conflict in eastern Ukraine. "They don't want me because I'm stubborn. I talk too much. I upset Gazprom,"! Vitrenko said in an interview with the
Kyiv Post. “I upset this 'peace process' that they have. It's that simple.” Naftogaz reported a quarterly loss after Vitrenko's departure Vitrenko, Kobolev and members of the Naftogaz the supervisory board have continued to exchange criticism via the media. On 28 April 2021, the
Cabinet of Ministers of Ukraine appointed Vitrenko as Chairman of the Board of Naftogaz for one year and on 26 April 2022 The Cabinet of Ministers of Ukraine extended the powers of Yuri Vitrenko as Chairman of the Board of Naftogaz of Ukraine until April 29, 2023. == Acting Ukrainian Minister of Energy (2020–21) ==