General info

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

Named among the notable practitioners in Bronze league by World Trademark Review 1000, 2023

Recognised among the leading lawyers in Privacy and Data Security by Best Lawyers International 2022


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



Kyiv Region Bar Association (admitted since 2009)



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

Media & Insight Oleg Klymchuk

10 February 2023


Yaroslav Ognevyuk and Oleg Klymchuk recognised by World Trademark Review 1000, 2023
28 December 2022


Sayenko Kharenko defended Société BIC in the dispute with the Ukrainian IP Office regarding the 3D mark
22 November 2022


Reservation of it specialists during martial law: what to expect from upcoming new rules and requirements?
18 November 2022


Sayenko Kharenko receives a record number of recognitions in the Client Choice Awards 2022 by Lexology
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