Oleg Klymchuk is a well-rounded intellectual property attorney with a particular focus on IT services outsourcing projects, technology, media and communications (TMC).

Oleg regularly advises on transactions involving brands, technology, data and content, particularly in the context of Ukraine-related cross-border M&A’s, join ventures, financing, licensing and other TMC related commercial and IP agreements.

Oleg routinely advises on IP infringement issues helping clients to cease infringements and manage the risks of potential IP infringement. Oleg’s experience and practice also include enforcement of brands and designs against imitation and unfair exploitation. He has also handled IP licensing contentious matters and open source licensing disputes.

Mr Klymchuk advises Sayenko Kharenko clients on the full range of legal issues related to advertising & marketing, data privacy and related issues. In addition, Oleg has substantial experience in entertainment related matters involving copyright, trademarks and media law.

Prior to joining Sayenko Kharenko in 2014, Oleg worked for one of the leading Ukrainian law firms and in the Kyiv office of an international law firm.


  • Recommended in intellectual property and recognised among the next generation lawyers for Intellectual property by The Legal 500, 2020
  • Recognised among the notable practitioners in IT by Ukrainian Law Firms 2021
  • Named among the notable practitioners in Intellectual Property by Ukrainian Law Firms 2021
  • Recognised among the leading lawyers in Privacy and Data Security by Best Lawyers International 2022


  • Kyiv Region Bar Association (admitted since 2009)


  • LL.M. from Kyiv Intellectual Property Institute of National University “Odesa Academy of Law”

Professional membership and involvement

  • International Trademark Association
  • The International Association for the Protection of Intellectual Property (AIPPI)
  • American Chamber of Commerce in Ukraine
  • European Business Association
  • Ukrainian Bar Association
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