Legal Opinions and Expert Witness Reports on Ukrainian Law
A London court needs to determine whether a Ukrainian corporate resolution was validly adopted. An arbitral tribunal in The Hague requires expert evidence on the enforceability of a bilateral investment treaty obligation under Ukrainian law. A New York law firm structuring an aircraft lease needs a legal opinion confirming that a Ukrainian security interest will be recognized.
These are not academic exercises — they are procedural requirements that determine whether transactions close and whether claims succeed. Jurvneshservice provides expert witness testimony and independent legal opinions on Ukrainian law for foreign courts, arbitration tribunals, and international transaction teams. Our lawyers have served as Ukrainian law experts in proceedings before courts and tribunals in the United States, the United Kingdom, Switzerland, Austria, and the Netherlands — including the Permanent Court of Arbitration in The Hague and the High Court of Justice in London.
Expert evidence and legal opinions — how they work
Foreign courts and arbitral tribunals treat foreign law as a question of fact requiring expert proof. When Ukrainian law is relevant — as the governing law, as the law of the place of performance, or as the law affecting enforceability — the tribunal requires either a formal legal opinion or live expert testimony from a qualified Ukrainian lawyer.
- Common law jurisdictions (US, UK) — expert witnesses submit written reports and may be cross-examined. The expert must comply with procedural rules of the forum (CPR Part 35, Federal Rules of Evidence)
- International arbitration (ICC, SCC, VIAC, PCA) — experts typically provide written opinions addressing specific legal questions formulated by the tribunal or the parties. IBA Rules on the Taking of Evidence apply in many proceedings
- Independent legal opinions — transaction counsel requires Ukrainian law opinions as a condition to closing. These confirm specific legal conclusions: capacity, enforceability of obligations, validity of security interests, regulatory compliance
This practice covers both functions — expert witness testimony for courts and tribunals, and independent legal opinions for transactions and disputes. For the underlying substantive work — structuring investments, drafting contracts, conducting arbitration — see our practice areas in International Contracts, Dispute Resolution, and Investing in Ukraine.
Scope of practice areas
Expert Witness on Ukrainian Law
Appointment as Ukrainian law expert by parties or tribunals. Written expert reports, oral testimony and cross-examination, responsive reports, and joint expert conferences. Our experts have testified before the Permanent Court of Arbitration in The Hague, the High Court of Justice in London, and courts in the United States, Switzerland, and Austria.
Independent Legal Opinions
Ukrainian law opinions for transactions and disputes — capacity, enforceability, validity of security interests, regulatory compliance. Aircraft leasing and ABS financing opinions, due diligence opinions, enforcement opinions, and arbitration opinions. Delivered in the format required by transaction counsel and international deal teams.
Navigate by situation
Select the scenario that matches your current need:
Your tribunal needs a Ukrainian law expert — a court or arbitral tribunal has ordered expert evidence on Ukrainian law, or a party intends to submit expert testimony. You need a qualified expert with doctoral-level academic credentials and practical experience who can present evidence meeting the procedural standards of your forum. → Expert Witness on Ukrainian Law
You need a legal opinion for a transaction or dispute — your deal team requires a Ukrainian law opinion as a condition precedent, or your litigation strategy requires an independent legal opinion on a Ukrainian law question. You need a structured opinion from a qualified Ukrainian lawyer that addresses specific legal conclusions. → Independent Legal Opinions
Subject matter expertise
Our expert opinions and legal opinions draw on the full range of the firm practice — areas where we combine academic research with direct experience in Ukrainian courts and international arbitration:
- Ukrainian corporate law — formation, governance, shareholder rights, validity of resolutions, director liability
- Ukrainian contract law — validity, penalties, limitation periods, mandatory rules, CISG
- Foreign investment law — bilateral investment treaties, investment protection, regulatory screening, expropriation
- Aviation law — aircraft registration, security interests, Cape Town Convention implementation, lessor rights
- Enforcement law — recognition of foreign judgments, arbitral awards, execution procedures, public policy
- International private law — choice of law, party autonomy, mandatory rules, public policy under Ukrainian law
How we work
We provide expert evidence and legal opinions as a standalone service — typically instructed by international law firms, arbitral tribunals, or transaction teams.
Step 1 — Engagement and scope. We review the instructions, identify the legal questions, and confirm the scope. For expert witness appointments, we verify conflicts and confirm compliance with the procedural rules of the forum. For legal opinions, we agree the assumptions, qualifications, and addressees.
Step 2 — Legal research and analysis. We conduct comprehensive research — legislation, judicial practice, doctrinal sources. Our analysis draws on both published sources and our direct experience in Ukrainian courts and international arbitration proceedings.
Step 3 — Draft and review. We prepare the draft opinion or expert report. For expert reports, we follow the format required by the applicable procedural rules. For legal opinions, we follow standard international opinion practice — assumptions, qualifications, conclusions, limitations.
Step 4 — Finalization and delivery. We deliver the final opinion or report. For expert witness engagements, we remain available for supplementary questions, responsive reports, and oral testimony. For transaction opinions, we issue the opinion in the form required for closing.
Who we work with
We provide expert evidence and legal opinions as Ukrainian law specialists — typically instructed by international law firms, foreign courts, arbitral tribunals, or transaction teams requiring independent Ukrainian law expertise.
Our clients include:
- International law firms instructing Ukrainian law experts for cross-border litigation and arbitration
- Arbitral tribunals (ICC, SCC, VIAC, PCA, LCIA, ad hoc) requiring expert evidence on Ukrainian law
- Foreign courts (United States, United Kingdom, Austria, Switzerland, Netherlands) needing Ukrainian law expertise
- Aircraft lessors and lenders requiring Ukrainian law opinions for lease and financing transactions
- International financial institutions requiring legal opinions for investment and lending operations
- Foreign investors requiring enforceability opinions and due diligence opinions on Ukrainian assets
Typical situations we handle:
- An international law firm in London instructs a Ukrainian law expert for investor-state arbitration at PCA — we provide expert testimony on investment protection law and bilateral treaty obligations
- A US court requires expert evidence on Ukrainian corporate law in a dispute involving a Ukrainian subsidiary — we prepare an expert report and testify at deposition
- An aircraft lessor needs a Ukrainian law opinion confirming enforceability of a security assignment under a structured lease — we deliver the opinion in the form required by transaction counsel
- An arbitral tribunal at SCC requires an expert opinion on Ukrainian enforcement law — we prepare the opinion addressing specific questions from the tribunal
- A foreign law firm needs an independent legal opinion on whether a Ukrainian penalty clause is enforceable — we provide the opinion with analysis of mandatory rules and judicial practice
Key experts
Doctor of Laws — Expert witness in PCA (The Hague), US, UK, Swiss, and Austrian courts. Ukrainian law opinions for aircraft leasing and ABS financing. Investment treaty expertise (Energy Charter, bilateral treaties)
Doctor of Laws — Expert on international arbitration and enforcement law. High Court of Justice (London). Author, Civil Procedure in Ukraine (Kluwer Law International). 25+ years of arbitration practice
PhD in Law — Choice of law and enforcement in cross-border contexts. Expert opinion preparation for High Court (London) and PCA (The Hague). Hague Principles research
FAQ: Legal Opinions and Expert Witness on Ukrainian Law
What qualifications should a Ukrainian law expert have for proceedings before a foreign court or tribunal?
Courts and tribunals assess expert qualifications based on academic credentials, professional experience, and publications. Our experts hold doctoral degrees from Taras Shevchenko National University of Kyiv, have published in peer-reviewed journals and international legal publications (including Kluwer Law International), and combine academic depth with over 25 years of practice in Ukrainian courts and international arbitration.
Can a Ukrainian law expert testify in English?
Yes. Our experts prepare reports and testify in English. Anna Tsirat and Kateryna Tsirat are fluent in English and have delivered expert evidence in English-language proceedings. Where the forum requires, we coordinate with certified translators for formal submissions.
How does the process work when a tribunal appoints the expert directly?
When appointed by a tribunal, the expert receives questions from the tribunal rather than from the parties. The expert prepares an independent report addressing only those questions, without advocacy for either side. Our lawyers have been appointed both by parties and directly by tribunals, and are experienced in maintaining the independence required by tribunal-appointed roles.
What is the difference between an expert witness report and a legal opinion?
An expert witness report is evidence submitted in litigation or arbitration — it explains Ukrainian law to assist the tribunal in deciding the case. A legal opinion is a professional document issued outside of proceedings — typically for transactions — confirming specific legal conclusions. Both require independence and professional responsibility, but they serve different purposes and follow different formats.
What areas of Ukrainian law do your opinions typically cover?
Our expert opinions and legal opinions most frequently address corporate law (validity of resolutions, shareholder rights), contract law (enforceability, penalties, mandatory rules), investment protection (bilateral treaties, regulatory screening), aviation law (aircraft security interests, Cape Town Convention), and enforcement law (recognition of foreign judgments and arbitral awards in Ukraine).
How long does it take to prepare an expert report or legal opinion?
Standard expert reports require two to four weeks from the date of instruction, depending on complexity and the volume of materials to review. Transaction opinions are typically delivered within one to two weeks. Urgent timelines can be accommodated — we have delivered opinions within days when required by court-imposed deadlines.
Related practices
Need a Ukrainian law expert or legal opinion?
We will assess your requirements and confirm scope, timeline, and availability — typically within 24 hours.
