Konstantin Kasyan, a senior associate in Orrick’s Moscow office, focuses his practice on dispute resolution in Russia and abroad. Konstantin acts as the main attorney leading representation of clients in major cross-border disputes.



Konstantin is a member of the firm’s Complex Litigation and Dispute Resolution Group. He is qualified to practice law in Russia and New York.



  • Konstantin's recent engagements include:

    Corporate Disputes

    • Representing one of the world's largest providers of mobile communications services in a multibillion dollar shareholder dispute  and working together with a New York-based arbitration team in a series of international arbitrations arising from this shareholder dispute.
    • Representing an American investment fund in a shareholder dispute regarding its Russian oil and gas assets and working together with a London-based arbitration team in an international arbitration arising from this dispute.
    • Representing the shareholders of one of the largest Russian publishers in a corporate dispute in the Cyprus courts regarding control over its Russian assets.
    • Representing a Japanese construction company in a shareholder dispute regarding its Russian subsidiary.
    • Representing one of the largest Russian agricultural companies in a corporate conflict in the Russian courts.
    • Representing a major Russian fund for investments in advanced technologies in a US litigation in connection with investments into a Russian plant.

    Contract Disputes

    • Representing a leading European producer of metallurgical equipment in an international arbitration arising from a service agreement.
    • Representing one of the largest Russian engineering companies in a series of arbitration proceedings arising from construction agreements.
    • Representing one of the world's largest manufacturers of computer graphics controllers in a lease agreement dispute.
    • Representing a leading Russian bank in debt litigation against one of its borrowers in the U.S. court.
    • Advising one of the largest Russian oil and gas companies on a multibillion settlement regarding oil field development project.
    • Advising a leading global natural resources company on potential arbitration with one of the largest Russian oil and gas companies regarding compensation for a stake in an oil field and then representing the client in negotiations that lasted more than five years.
    • Representing a European investment fund in an unjust enrichment case arising from a lease agreement.

    Unfair Competition, Advertising and Concerted Action Disputes

    • Represented a leading international snack food company in a number of unfair competition disputes.
    • Represented one of the world's largest manufacturers of household chemicals in an unfair competition dispute.
    • Represented one of the world's largest manufacturers of notebooks in a concerted action case.
    • Represented a major international tobacco company in tobacco advertising cases.
    • Represented a leading European pharmaceutical company in an advertising case.

    Real Estate Disputes

    • Represented a European investment fund in an unjust enrichment case.
    • Represented one of the world's largest manufacturers of computer graphics controllers in a lease agreement dispute.

    Debt Disputes

    • Advised one of the leading national producers and suppliers of electricity in a multimillion dollar dispute arising from loan and share pledge agreements.
    • Represented another major national supplier of electricity in a series of disputes regarding the invalidation of pledges of shares.

    IP Disputes

    • Represented a leading international snack food company in a number of trademark disputes.

    Cybercrime and Cybersecurity

    • Represented technology companies and financial institutions in litigation to enforce their rights against cybercrime and intellectual property theft, including disputes involving trade secret misappropriation, fraud, privacy breaches, online advertising abuse, spam email, phishing, and technical threats, such as malware and botnets.
    • Advise companies regarding compliance with laws and regulations involving data cybersecurity and data privacy.

    Customs and Currency Disputes

    • Represented one of the world's largest manufacturers of chewing gum in a series of customs disputes.
    • Represented one of the world's largest manufacturers of clothing in a customs dispute.
    • Represented one of the world's largest manufacturers of chewing gum in a series of currency disputes, involving $3 million.

    Tax Disputes

    • Represented a major international tobacco company in a multimillion dollar tax dispute.
    • Represented a leading international snack food company in a series of tax disputes.

    White-Collar Crime Cases

    • Representing a Russian individual, a former high-ranking employee of a leading state-controlled energy company, in a white-collar crime case brought against him by the US authorities.
    • Advising one of the world's largest providers of mobile communications services in an investigation regarding white-collar crime case initiated by the US authorities.
    • Representing one of the leading global software producers in a series of cybercrime litigations in the US courts.
    • Representing one of the world's largest tobacco producers in a fraud-related investigation.
    • Representing one of the global pharmaceutical companies in an investigation regarding fraud committed in Russia.

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