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Oleh Marchenko is a partner at MARCHENKO PARTNERS. He chairs the dispute resolution practice and specialises in public international law, investor–state disputes and alternative dispute resolution. 

Oleh is recognised as a top-tier lawyer in dispute resolution in Ukraine by The Legal 500 EMEA and as a leading lawyer in Arbitration & Mediation in Ukraine by Best Lawyers. 

His past professional experience includes International Trade and World Trade Organization disputes, M&A, and transactional cross-border taxation with top-tier recognitions by Chambers and Partners, The Legal 500 EMEA, Who’s Who Legal and International Tax Review.

Recent cases include: acting for a US-based publicly listed global 500 pharmaceutical company in an investment dispute and investor–state negotiations with Ukraine related to violation of IP rights (the dispute was settled in 2017);
acting for US–French individual investors and their Luxemburg subsidiary in an investment dispute and investor–state negotiations with Ukraine related to arbitrary tax measures and unreasonable trade restrictions;
advising a publicly listed real estate developer and its shareholders, on strategy, merits and jurisdictional matters of contemplated investment claims related to a denial of justice and indirect expropriation;
advising a publicly listed global 500 pharmaceutical company on strategy, merits and jurisdictional matters of contemplated investor–state claims against Ukraine related to arbitrary and discriminatory regulatory measures; acting for a global tobacco company in investor–state dispute and negotiations with Ukraine related to arbitrary withdrawal by Ukraine of tax benefits from inward processing operations of its local subsidiary.