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Management
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Sergii KoretskyiChairman of the Board & CEOSergii Koretskyi has more than 20 years of experience in oil production and refining, energy retail, wholesale management, and international financing.
He previously headed the Western Oil Group, and served as CEO of the Continuum Group and WOG.
He has substantial experience in managing large-scale investment projects and M&A transactions. He was a co-founder and Chairman of the Board of the energy trading company Centurion Group SA (Switzerland).
From November 9, 2022, Mr. Koretskyi held the position of Director of Ukrnafta and Ukrtatnafta. Under his leadership, Ukrnafta increased oil and gas production and became a profitable state-owned company while posting record financial results.
Since May 14, 2025, he has served as Chairman of the Board of Naftogaz of Ukraine.
He holds degrees in Mechanical Engineering and Business Economics from Lutsk Technical University, as well as a degree in Oil and Gas Production from Ivano-Frankivsk National Technical University of Oil and Gas.
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Oksana VolynetsMember of the Executive Board, Chief Legal and Regulatory Officer of Naftogaz GroupOksana Volynets has over 20 years of legal experience, with a strong focus on corporate governance, mergers and acquisitions, and complex corporate litigation.
She has led the relevant departments at Continium Group and PJSC Ukrnafta.
She earned her law degree from Lesya Ukrainka Volyn National University.
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Sergii FedorenkoMember of the Executive Board, CCOHas over 10 years of experience in the oil and gas industry.
Previously, he held a similar position at PJSC Ukrnafta, where he was responsible for purchasing and selling petroleum products, managing supply logistics, trading in gas and electricity, developing the gas station network, and facilitating B2B fuel sales to corporate clients.
Prior to joining Ukrnafta, he served as Chief Commercial Officer at Ukrgasvydobuvannya (2015-2023), where he also sat on the Executive Board. At the same time, he headed Naftogaz Oil Trading from 2019 to 2022.
In 2022-2023, he served as a volunteer in the Armed Forces of Ukraine.
He holds a master's degree in political science from the National University of Kyiv-Mohyla Academy and an MBA from the Kyiv School of Economics.
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Olena ArtazeiMember of the Executive Board, Chief Human Resources Officer of Naftogaz GroupOlena Artazei brings over 15 years of experience in human resources, organizational development, and change management across both the public and private sectors.
She previously worked as HR and Customer Service Director at WOG, HR Director at Ukravit, and Head of the Department for Monitoring and Performance Evaluation at the State Property Fund of Ukraine.
From 2022 to 2025, she held the position of HR Director at Ukrnafta. Olena has been recognized as one of the top 10 HR directors in Ukraine.
In June 2025, she was appointed to the Management Board of Naftogaz Group.
She holds a degree in journalism from Dnipropetrovsk National University.
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Roman ChumakMember of the Executive Board, Chief Financial Officer of the Naftogaz GroupChief Financial Officer of the Naftogaz Group. On September 28, 2021, he was appointed a member of the Board of Naftogaz of Ukraine.
Roman Chumak is responsible for establishing relations of Naftogaz Group companies with banks and financial institutions, attracting financing in domestic and international financial markets, short-term planning and balancing of the Group’s liquidity, transactions with securities, and other treasury operations of the Group.
Roman is one of the most experienced employees of Joint Stock Company “National Joint Stock Company Naftogaz of Ukraine”. He has been working for the Company for more than twenty-two years, holding positions from chief specialist to department head. Prior to that, he worked in large banking institutions and private business.
He graduated from the Kyiv State University of Trade and Economics with a degree in economics. He holds a Ph.D. in Economics and MBA.