

Ilyashev & Partners
Client Satisfaction‘Market legend’ Ilyashev & Partners is a go to for domestic and international businesses, HNW individuals and high-ranking state officials. The team has a strong cross-border offering and advises on cross-border litigation and international arbitration, with notable expertise in investment, international commercial and sports arbitration. It has noticed a recent increase in maritime and insurance disputes alongside its specialist practice in tax, IP, labour, shareholder, and real estate and construction disputes. Debt collection and insolvencies are other areas of expertise. Practice co-head Roman Marchenko is active in international arbitration proceedings, with experience in courts in Ukraine, England and the Supreme Court of the Seychelles. Mikhail Ilyashev co-leads the dispute resolution team and boasts an active national and international practice, with a successful track record in the aviation sector. Appointed as co-head of the team in December 2023, Oleh Trokhymchuk advises an impressive roster of national, foreign and international companies and state enterprises. Insolvency expert Andrii Konoplia was also appointed practice co-head in December 2023, and Sergey Nedelko heads the firm’s Odesa office. Roman Protsyshyn focuses on arbitration, particularly investment, commercial and sports matters, along with Marina Riashchenko, who has experience in arbitration involving sovereign parties.
Testimonials
Collated independently by Legal 500 research team.
‘The team has great experience in dispute resolution in Ukraine. Andrii Konoplia has excellent understanding and unique experience in handling commercial, corporate litigations in Ukraine. Roman Protsyshyn has good understanding how foreign law concepts are applicable in complex Ukrainian litigations. ’
‘A highly qualified litigation firm with decades of experience, Ilyashev & Partners, represents us in dozens of multi-million-dollar enforcement proceedings, bankruptcy proceedings, and commercial litigations. The way they have handled our requests, as well as their prompt response time, has made me extremely satisfied with their service. With their expertise at our disposal, we are sure to be in capable hands when it comes to legal matters. As soon as somebody asks my recommendation about the Ukrainian law firm, I think of them first. No matter what the issue is, I would use them without hesitation. In Ilyashev & Partners, I noticed that there is a very strong commitment to their profession that impressed me. For me, what made them special was their ability to develop strategies that were put into action. The quality of the work they produce is of the highest standard.’
‘I consider Roman Marchenko to be a brilliant, highly strategic leader who possesses an encyclopedic level of technical knowledge about dispute resolution. Litigation is his forte, and he is a real asset when challenging cases arise. He is respected and trusted by all of his peers, as well as by the local judiciary. I am thoroughly impressed by Andrii Konoplia and Vadym Kizlenko's profound knowledge, attention to detail, and exceptional problem-solving abilities. I recommend them in the highest regard as specialists to the highest standard.’
‘Mikhail Ilyashev is a fantastic lawyer to work with. He is very pragmatic in his assessment of problems and focuses on finding the right solution. The legal strategy developed by Mikhail is of the highest quality and he personally represents our interests in court. His remarkable speaking skills can sway even the toughest judges. The fact that he is our advocate means a lot to us. A force of nature in the criminal defense field, Mikhail Ilyashev is no ordinary lawyer. In addition to having skill and passion, he is fearless in taking on the battle, personally standing by our side at each stage of the legal process. In court as well as during interrogations, his commitment is truly admirable and inspiring.’
‘The experience of working with Ilyashev & Partners exceeded our expectations. We contacted this law firm because it is considered the best in dispute resolution. I can say with confidence that this firm is a market legend for a reason. The Ilyashev & Partners team consists of high-performance professionals who are perfect in their field. Ilyashev & Partners deserve all praise for their work. There is a great deal of expertise that Ilyashev & Partners brings to each case and develops solutions accordingly. Several strategies were offered in each case. The practice team always kept in touch with us. All the progress has been reported to us. As lions, they fought for our interests as if they were fighting for their own. They also prepared such a solid foundation for each case that, in the end, it was impossible for the opponents to compete with them. In all our cases, we were able to achieve the desired results.’
‘Roman Protsyshyn has an academic background and many years of arbitration practice behind him. It has been a long time since I met such an extraordinarily intelligent lawyer. Roman Protsyshyn has done outstanding work in our cases, and we couldn't be happier. Roman is someone we would pick any day as our co-counsel. Aside from his excellent strategic judgment, he is also a great advocate. Whenever a hearing is held, he is always prepared, passionate about what he does, speaks brilliantly, and always cares as much about the case as we do.’
‘Roman Marchenko has earned a reputation as one of the nation's top trial lawyers. By offering his technical knowledge, expertise, unparalleled insight into complex matters and business skills, Roman Marchenko exemplifies what it means to be a true leader by example. Oleh Trokhymchuk provides us with reliable and timely support and legal advice. He is a highly professional and skilled litigator, very sharp and concise in his responses. The advice he provides is constructive and practical.’
‘We single out Mikhail Ilyashev, Valeriya Gudiy, Sergey Nedelko and Marina Ryashchenko. Mikhail Ilyashev is a leader and lawyer who immediately grasps the essence of the problem, proposes measures to address the root cause of the conflict, assesses risks thoroughly and offers a plan of action. Valeriya Gudiy has very deep knowledge in the field of labour law and is one of the leaders in Ukraine's legal market in this area. Her work is always creative, thorough and results-oriented. Sergey Nedelko is a high-class specialist in maritime law. His creativity, problem-solving skills in the most complex situations and excellent handling of cases in court are noteworthy. Marina Ryashchenko is an expert in damage recovery, including the ones that occurred as a result of the Russian Federation's armed aggression against Ukraine. She is highly qualified, creative and handles complex cases effectively. Dmitry Hruby demonstrates intellect, sharp reasoning and the ability to resolve and achieve results in the most challenging cases.’
Key clients
- Biopharma
- CENTRAVIS
- Plant 410 Civil Aviation
- Coca-Cola Beverages Ukraine
- COFCO Agri Resources Ukraine
- CRH Ukraine
- Ferrexpo AG
- J.S. Corrugating Machinery Co., Ltd
- Dr. Reddy’s Laboratories
- GrainCorp
- Group DF
- Ukrainian Fencing Federation
- Ukrrichflot
- Ukrspecexport
- Unilever Ukraine
- Ukrainian Red Cross Society
- Ukrcement
Work highlights
- Representing FSC 'Morye' in the European Court of Human Rights in a dispute regarding rights of the company infringed as a result of illegal nationalisation of its assets in the Crimea.
- Preparation of an expert report in the investment treaty arbitration against Ukraine at the Arbitration Institute of the Stockholm Chamber of Commerce.
- Representing Alchevsk By-Product Coke Plant in complex proceedings with respect to the recovery of losses suffered in course of the military aggression of the Russian Federation and occupation of the territory of Ukraine.
Lawyers


Practice head
The lawyer(s) leading their teams.
Roman Marchenko, Mikhail Ilyashev, Oleh Trokhymchuk, Andrii Konoplia