News date: 19 March 2026
Ilyashev & Partners has once again confirmed its position as a leading law firm in Ukraine, achieving Band 1 ranking in Domestic Dispute Resolution in the Chambers Europe 2026 guide, published on 19 March 2026.
Consistently ranked among the top-tier law firms in Ukraine, Ilyashev & Partners holds strong positions across key practice areas, including Domestic and International Dispute Resolution, Restructuring/Insolvency, Employment, and Intellectual Property.
Managing Partner Mikhail Ilyashev and Senior Partner Roman Marchenko are recognised among the leading dispute resolution lawyers in Ukraine, achieving Band 1 and Band 2 rankings respectively in Domestic Dispute Resolution.
Roman Marchenko is the only Ukrainian lawyer ranked by Chambers Europe 2026 in both Domestic and International Dispute Resolution, underscoring the firm’s strength in cross-border litigation and international arbitration. He is also recognised in Restructuring/Insolvency.
Oleksandr Fefelov, Partner and Head of Antitrust and Competition Practice, is ranked Band 2 in Competition/Antitrust, further strengthening the firm’s position in complex competition matters.
Valeriia Gudiy, Partner, is ranked Band 2 in Employment, reinforcing the firm’s recognised expertise in labour and employment law.
Dispute Resolution
Domestic Dispute Resolution (Band 1)
Leading Lawyers: Roman Marchenko (Band 1) and Mikhail Ilyashev (Band 2)
International Dispute Resolution (Band 2)
Leading Lawyer: Roman Marchenko (Band 3)
What the Team is Known For
Ilyashev & Partners is renowned for its strong presence on the domestic litigation scene, with outstanding capabilities in commercial dispute resolution. The law firm is particularly active in corporate, contractual, tax, and major debt recovery disputes, and in assisting with matters against state authorities and banks. The legal practice acts in notable disputes within the energy sector. Ilyashev & Partners is also active in cross-border disputes, including international arbitration, with particular experience in commercial arbitration mandates. The law firm has noteworthy activity in shareholder disputes and in defence of significant businesspeople against allegations of embezzlement and fraud. The legal practice is active in applying to the ECtHR in disputes relating to alleged infringement of property rights.
“Ilyashev & Partners is precise, relentless in preparation, and able to adapt litigation tactics swiftly to changing circumstances. They remain focused on achieving commercially sound outcomes,” says the source.
“Ilyashev & Partners combines strategic vision with a deep understanding of cross-border disputes. Their guidance is consistently reliable,” clients note.
Leading Lawyers
Managing partner Mikhail Ilyashev is highly regarded for his wealth of expertise in handling a broad variety of litigation, including in relation to the agriculture, manufacturing and energy industries.
“Mikhail Ilyashev is a lawyer who does not know defeat – he leads his team to victory even in situations that seem hopeless at first glance,” clients note. “Mikhail is renowned for his litigation expertise and persuasive courtroom advocacy. He combines procedural mastery with strategic insight, ensuring that each case is approached with precision.”
Senior partner Roman Marchenko is a market-leading litigator handling disputes in Ukrainian courts. He also has a notable presence in international arbitration, representing clients from the banking, aviation, and energy sectors.
“Roman Marchenko is a brilliant lawyer and very responsive. He is an excellent expert in Ukrainian courts and litigation in general,” says the source. “Roman Marchenko is an exceptional litigator. His strategic mindset, deep understanding of complex disputes and unwavering dedication to his clients are truly impressive.”
Competition/Antitrust
Leading Lawyer: Oleksandr Fefelov (Band 2)
Leading Lawyers
Oleksandr Fefelov has a strong focus on behavioural matters, representing clients in investigations into possible abuses of dominance and alleged bid rigging. He has further experience in merger control filings and competition law compliance mandates.
“He has deep knowledge of competition law, especially AMCU practice, and is practical and precise,” clients note.“Oleksandr Fefelov is strategic, brilliant in his advocacy, and completely client-focused.”
Employment (Band 2)
Leading Lawyers: Valeriia Gudiy (Band 2)
What the team is known for
Ilyashev & Partners is noted for its expertise in employment litigation. The firm also advises on compliance issues, with further experience in management-level dismissals and employment agreements. The team’s client roster features companies from the manufacturing, insurance, technology, and pharmaceuticals sectors. The firm also represents private individuals in employment disputes. The team also handles disputes relating to seafarers’ employment and compensation.
“Ilyashev & Partners stands out for its deep expertise in wartime labour law. It provides clear, practical guidance on rapidly changing regulations and takes a proactive approach,” says the source.
Leading Lawyers
Head of department Valeriia Gudiy is well placed to advise on a range of regulatory and compliance as well as contentious matters. She acts on matters linked to conscription under martial law, layoffs and restructurings, and trade union or termination disputes.
Clients highlight that Valeriia Gudiy is an exceptional employment lawyer and is very client-oriented. “We feel fully comfortable working with her. She always puts our interests first, responds promptly and in court is simply the best,” says the source. “Valeriia Gudiy combines deep expertise in labour and wartime legislation with a very practical, solution-oriented approach.”
Intellectual Property (Band 4)
What the team is known for
Ilyashev & Partners’ intellectual property law practice is best known for acting in contentious cases. The team acts for domestic and international clients, often from the pharmaceutical sector. The law firm is active in patent, copyright, and trademark registration and disputes.
“The law firm effectively coordinates litigation strategies across different jurisdictions, anticipating procedural challenges and structuring defences with the long-term business impact in mind,” clients note. “Ilyashev & Partners is responsive and result-oriented.”
Notable practitioners
Mikhail Ilyashev is a key client contact for this practice.
Restructuring/Insolvency (Spotlight)
Notable Practitioners: Roman Marchenko (Spotlight)
What the team is known for
Ilyashev & Partners is recognised for its strong insolvency practice, supported by its highly regarded litigation team. It is particularly visible in bankruptcy proceedings and possesses further experience in assisting with asset recovery and debt restructurings. The team acts for local and international banks and distressed companies regarding liabilities and disputes arising from bankruptcy and insolvency proceedings.
Notable practitioners
Roman Marchenko is a well-established litigator with significant expertise in insolvency and bankruptcy proceedings.
Chambers Europe is one of the most authoritative legal directories globally, published by Chambers & Partners since 1999. The guide identifies and ranks the leading law firms and lawyers across Europe, serving as a key benchmark for clients seeking top-tier legal expertise. The rankings are based on rigorous independent research, including in-depth market analysis and interviews with thousands of clients and legal professionals, ensuring an objective and independent assessment of the quality of legal services, professional reputation, and market position.