News date: 15 October 2026
Ilyashev & Partners Law Firm has been recognized across 23 practice areas in the Ukrainian Law Firms 2026. A Handbook for Foreign Clients ranking.
The firm received the highest rating status of Leading Firm in 9 practice areas: Bankruptcy; Domestic Litigation; Cross-Border Litigation; International Arbitration; International Trade; Labor and Employment, Immigration; Military Law and Defense Industry; Pharmaceuticals & Healthcare; Maritime & Shipping.
Four practice areas were recognized as Advanced Practices: Antitrust and Competition; Energy & Natural Resources; Intellectual Property; Tax Litigation.
The firm’s other practices were recognized among Established Practices: Agribusiness; Public Procurement; Corporate and M&A; Criminal Law (including White-Collar Crime, Anticorruption, War and Military Crimes); War Damage Recovery; IT and Telecommunications; Real Estate, Construction, Land; Aviation; Tax Consulting.
Agribusiness: Established Practice
Ilyashev & Partners demonstrated a diverse and active presence in the Agri sector, advising international agricultural traders, producers, investors and Ukrainian agribusiness groups on commercial disputes, commodity trading, asset protection, insolvency, regulatory compliance, cross-border transactions and wartime risks.
Key practitioners include Roman Marchenko, Senior Partner, focusing on international arbitration and cross-border disputes; Valeriia Gudiy, Partner, specialising in commercial litigation; Olena Omelchenko, Partner, advising on trade regulation. The firm’s Odesa office, led by Sergey Nedelko, offers strong expertise in maritime and shipping law.
Antitrust and Competition, Public Procurement
Antitrust and Competition: Advanced Practice
Notable Practitioner: Oleksandr Fefelov
Public Procurement: Established Practice
Ilyashev & Partners has one of the most established and active antitrust and competition practices in Ukraine, combining deep regulatory expertise with strong litigation capabilities.
The practice is headed by Oleksandr Fefelov, Partner, who specialises in competition regulation, merger control, and AMCU proceedings. Oleksandr Denysenko, Counsel, focuses on competition litigation.
Bankruptcy: Leading Firm
Leading Individual: Vadym Kizlenko
Notable Practitioners: Roman Marchenko, Andrii Konoplia
Ilyashev & Partners has a notable bankruptcy practice that advises debtors, creditors, and insolvency professionals. Backed by one of the largest teams on the market, the firm is a go-to advisor for high-profile, complex bankruptcy cases and is recognized for its extensive experience representing distressed industrial companies and state-owned enterprises.
Senior partner Roman Marchenko provides strategic leadership and handles high-stakes, large-scale cases. Vadym Kizlenko, co-head of the insolvency and financial restructuring practice, plays a central role in managing complex, multi-creditor proceedings. Fellow co-head Andriy Konoplya is a longstanding contributor to the firm’s bankruptcy expertise.
Corporate and M&A: Established Practice
Notable Practitioner: Yevgen Solovyov
Ilyashev & Partners advises Ukrainian and international investors, corporate groups and shareholders on acquisitions, corporate governance, ownership disputes, restructuring and the protection of investments. Its practice is particularly active in complex corporate conflicts involving strategic industrial assets and foreign investment structures.
The practice is headed by Mikhail Ilyashev, Managing Partner. Senior Partner Roman Marchenko advises clients on complex corporate transactions, acquisitions, disposals and cross-border restructurings involving Ukrainian assets. The core team also includes partners Oleksandr Fefelov and Yevgen Solovyov.
Criminal Law (including White-Collar Crime, Anticorruption, War and Military Crimes): Established Practice
Notable Practitioner: Kostiantyn Kryvenko
Ilyashev & Partners’ criminal law practice is known for its deep involvement in politically sensitive, high-value, and precedent-setting matters involving leading Ukrainian businesses, international investors, and senior executives. The team advises on a broad range of criminal matters, including treason, fraud, money laundering, and regulatory offenses. The practice has notably expanded its scope, handling cases related to collaborationism, defense procurement fraud, and sanctions.
The practice is led by Kostiantyn Kryvenko, Counsel and Head of Criminal Law, specialising in white-collar crime, asset protection and complex investigations, supported by Mikhail Ilyashev and Roman Marchenko in strategically significant proceedings.
Dispute Resolution: Domestic and Cross-Border Litigation
Domestic Litigation: Leading Firm
Celebrated Practitioner: Mikhail Ilyashev
Leading Individual: Roman Marchenko
Notable Practitioners: Oleksandr Denysenko, Valeriia Gudiy, Oleh Trokhymchuk
Cross-Border Litigation: Leading Firm
Notable Practitioners: Roman Marchenko, Roman Protsyshyn
Dispute resolution is a core and long-standing strength of Ilyashev & Partners, which commands a strong reputation in both domestic and cross-border litigation, regularly representing clients in multi-jurisdictional disputes across commercial, tax, insurance, IP, and insolvency matters. The firm also has extensive experience in international commercial and investment arbitrations, with the primary focus on military, commodities, oil and gas, aviation, shipping, shareholders, and banking disputes.
The firm’s dispute resolution practice is co-led by Oleh Trokhymchuk, who focuses on banking and energy disputes, and Andrii Konoplia, who specializes in bankruptcy proceedings and major loan-related cases. Key litigators include Valeriia Gudiy (labor disputes), Sergey Nedelko (maritime claims), and Oleksandr Denysenko (contractual and shareholder conflicts). Roman Marchenko leads the cross-border litigation efforts and frequently provides expert opinions on Ukrainian law. Managing partner Mikhail Ilyashev also handles high-profile disputes and has been engaged as a legal expert.
Energy & Natural Resources: Advanced Practice
Ilyashev & Partners advises energy companies, investors, industrial suppliers and infrastructure developers on energy regulation, project contracts, international arbitration, competition and commercial disputes.
Mikhail Ilyashev, Managing Partner, leads the energy practice. Partner Valeriia Gudiy focuses on regulatory, commercial, and dispute-related matters in the energy sector, including renewable energy and electricity market regulation.
Intellectual Property: Advanced Practice
Ilyashev & Partners advises international corporations, pharmaceutical manufacturers, software developers, media businesses, and Ukrainian institutions on trademarks, copyright, licensing, brand protection, and IP litigation.
Andriy Lytvyn, head of the Kharkiv office, is involved in IP practice workload. Mikhail Ilyashev, managing partner, supervises the practice.
International Arbitration: Leading Firm
Celebrated Practitioners: Roman Marchenko
Leading Individuals: Roman Protsyshyn
Notable Practitioners: Marina Riashchenko
War Damage Recovery: Established Practice
Counsel Roman Protsyshyn received market praise for his performance in arbitration and cross-border disputes. Marina Riashchenko, counsel, is a highly visible arbitration practitioner.
International Trade: Leading Firm
Leading Individuals: Olena Omelchenko
Ilyashev & Partners has an established international trade practice covering trade remedies, anti-dumping investigations, customs regulation, market access, and cross-border commercial disputes. The firm represents Ukrainian manufacturers in proceedings intended to protect domestic industries from allegedly dumped imports.
Olena Omelchenko, Partner and Head of International Trade, leads the practice, focusing on trade defence, customs and regulatory matters. Key members of the team include Karine Altunian and Kateryna Solodovnyk.
IT and Telecommunications
IT: Established Practice
Telecommunications: Established Practice
Ilyashev & Partners advises telecommunications operators, software developers, international technology companies and digital rights holders on regulatory compliance, technology contracts, intellectual property and commercial disputes.
Labor and Employment, Immigration: Leading Firm
Leading Individual: Valeriia Gudiy
Ilyashev & Partners advises Ukrainian and international employers on employment contracts, labour disputes, HR compliance, executive employment, workforce restructuring and wartime employment regulation. The practice has particular experience in military registration, mobilisation deferments and the retention of essential personnel.
The practice is led by Valeriia Gudiy, Partner, specialising in employment advice and labour disputes, with Oleh Trokhymchuk, Counsel, contributing expertise in internal investigations and employment-related litigation.
Military Law and Defense Industry: Leading Firm
Ilyashev & Partners advises defence manufacturers, exporters, military suppliers, employers and individuals on defence procurement, international arbitration, regulatory compliance, mobilisation and military service matters.
Roman Marchenko, Senior Partner, leads defence-related disputes, while Mikhail Ilyashev, Managing Partner, advises on strategic matters.
Pharmaceuticals & Healthcare: Leading Firm
Notable Practitioner: Alla Tsymanovska
Ilyashev & Partners advises pharmaceutical manufacturers, healthcare businesses and medical equipment suppliers on intellectual property, market access, competition, regulatory compliance and public procurement.
Alla Tsymanovska boosted her visibility with performance in high-profile medical cases.
Real Estate, Construction, Land: Established Practice
Notable Practitioner: Dmytro Hrybov
Ilyashev & Partners Law Firm is renowned for its expertise in high-value property rights and regulatory disputes, including those involving state-owned assets, foreign investments in agricultural land, and cross-border construction deals.
The practice is led by Dmytro Hrybov. A key role in the team is played by Dmytro Hruba. Mikhail Ilyashev, Managing Partner, and Roman Marchenko, Senior Partner, provide strategic oversight of complex real estate and investment matters.
Tax and Transfer Pricing
Tax Litigation: Advanced Practice
Tax Consulting: Established Practice
Notable Practitioner: Ivan Maryniuk
Ilyashev & Partners’ tax practice offers dedicated advisory services on complex tax matters, advising domestic businesses, multinational groups and international organizations on corporate taxation, cross-border tax structuring, transfer pricing, tax compliance and disputes with Ukrainian tax authorities. The practice addresses the tax implications of international investment arrangements, commercial operations, restructuring and projects financed by foreign institutions. Throughout the research period, the firm had a strong track record of advising on market entry strategies and tax structuring solutions. Ivan Maryniuk is Head of Tax Practice.
Transport: Aviation, Maritime & Shipping
Aviation: Established Practice
Notable Practitioner: Roman Marchenko
Maritime & Shipping: Leading Firm
Notable Practitioner: Sergey Nedelko
Ilyashev & Partners holds leading positions in both aviation and maritime. The team is regularly engaged in matters involving aircraft manufacturers, airlines, insurers, shipowners, P&I Clubs, ports, logistics operators and state enterprises.
Roman Marchenko, head of the transport, aviation and maritime practice, represents interests in international arbitrations and acts as an independent expert on Ukrainian law in foreign courts. Sergey Nedelko, Counsel and Head of the Odesa Office, specializes in ship arrest, cargo claims, demurrage disputes, and disputes with port, customs, and environmental authorities.