Insight

Olga Prosyanyuk of Aver Lex on Her Criminal Defense Practice

Aver Lex won the 2019 "Law Firm of the Year" award for Criminal Defense in Ukraine.

Meet Viktor Yanukovych's Lawyer
Best Lawyers

Best Lawyers

November 14, 2018 10:06 AM

Olga Prosyanyuk and her colleagues were among the only lawyers in Ukraine to interrogate its high-ranking politicians, in their defense of Viktor Yanukovych. Now, the attorney with the 2019 “Law Firm of the Year” winning Ukranian firm Aver Lex discusses her criminal defense practice with Best Lawyers CEO Phillip Greer.

What inspired you to focus your expertise in criminal defense?

Our company was established as a legal boutique with a focus on criminal law in 2012. The choice of specialization was based on several factors. Firstly, the firm’s partners had an established track record of protection in criminal cases, along with a vision of the development of this practice within the company. And, notably, we already had a really strong team of criminal defense attorneys on board. At the time there was a lack of competition in this area on the market. Finally, I had an internal feeling about the upcoming growth of the criminal law practice and its formation into a separate fully-fledged service, independent of judicial practice. Not to mention, we had a strong will to be the best in this new field.

Did you have any mentors who helped shaped your career early on?

At the university, one of my mentors was a professor in the civil law department: Elena Kokhanovskaya. She was among those who instilled in me a burning interest in competing in the trial with worthy opponents. And you know what? During the defense of my thesis to obtain the degree of candidate of juridical sciences, there were also opponents—leading academic lawyers. And it was Elena who has acted as my opponent.

I'm always inspired by reaching the level of achievements of Natalia Kuznetsova. She’s one of the most respected scientists and prominent representative of the Ukrainian legal community. For me, she is an example of a professional, deeply in love with her work.

What is the story behind the founding of Aver Lex?

We established our firm together with my partner Vitaliy Serdyuk. This decision was conscious and carefully thought through. I remember how we chose our first office, designed it, but the company’s name still was not there. The whole team came up with ideas for the name. It’s popular to use the surnames of founders in a company’s name, but we wanted something very special, which reflected our values and goals. That’s how the name Aver Lex appeared: "The Law Is Above All!”

What achievements are you most proud of from this past year that led to Aver Lex being named a "Law Firm of the Year" for Criminal Defense?

Our main achievement is the realization of the goal set for the fifth anniversary of the company to become the leading highly specialized defense firm in Ukraine. As you may know, our team became a point of choice by many high ranked officials, politicians and businessmen. No wonder, these cases are usually very sensitive and often politically motivated. We are proud to lead cases which have no analogies in Ukraine.

Our team sustained absolutely unprecedented pressure during the defense of Viktor Yanukovych, ex-president of Ukraine. This is the most resonant case in the history of the Ukrainian judiciary. We are the only lawyers on the territory of Ukraine and other CIS countries who immediately interrogated several state officials straight on the air: three presidents of Ukraine, including the current president; two Prime Ministers; the current speaker of the Verkhovna Rada of Ukraine; and a number of others.

Consequently, our professional rights were violated. This situation has been widely covered in Ukrainian and foreign media and initiated a professional discussion regarding the rights of attorneys in Ukraine. Responding to the strong support of the legal community, and professional and human rights organizations, we collected evidence of systematic violations of the professional rights of attorneys in Ukraine. We prepared a special report that was presented in September. During the preparation of the report I conducted several meetings, including with the deputies of the European Parliament, international human rights defenders and the representative of the special procedures section of the Office of the United Nations High Commissioner for Human Rights, who were notified of significant cases of pressure on Ukrainian lawyers and violations of their rights.

Overall, I think that our public position to defend our profession and to change the rules of the game in the country is the most important achievement of this past year.

Are there any other attorneys at your firm whom you would like to recognize who greatly assisted the firm in winning your major decisions?

Of course, our high achievements are the result of the dedicated work of the entire team. The team of lawyers in the sphere of politically motivated cases is headed by the senior partner Vitaliy Serdyuk and partner Igor Fedorenko. The Business Defense team is led by partner Artem Drozdov.

Is there anything else about this practice area or other groups that the firm is particularly proud of?

It’s very important for our team and me personally to contribute to the development of the legal profession in our country. Most recently I headed the advocacy group of attorneys’ rights protection. Together with the Ukrainian section of the International Society of Human Rights, we prepared a special report on the violation of attorneys’ rights in Ukraine. Its presentation took place in September.

I hope that we can attract attention to this problem and encourage attorneys not only to report on violations but also to use all existing instruments to preserve their rights on advocacy. In my opinion, attorneys play an exceptionally important role in our country on its path to reforms. The rights and guarantees for legal professionals are the fundamental principles in establishing access to justice.

Last year our company turned five years old. During these years we have managed to implement a ten-year development plan. For the future period, we set ourselves the main task—to maximize the criminal practice internationally.

Related Articles

The Company They Keep


by Best Lawyers

Thomas Richter discusses the idea of corporate criminal liability.

An Interview With HammPartner

How This Firm Is Shaping the Economic Future of Ukraine


by Best Lawyers

Denis Lysenko discusses how AEQUO has helped build a new business environment.

An Interview With AEQUO

An Interview With Bougartchev Moyne Associés


by Best Lawyers

France’s 2020 “Law Firm of the Year” honoree in Criminal Defense Law

An Interview With Bougartchev Moyne Associés

An Interview With Sayenko Kharenko


by Best Lawyers

Ukraine's 2020 “Law Firm of the Year” winner in Capital Markets Law

An Interview With Sayenko Kharenko

How Preventative Counsel Is Changing Criminal Defense


by Best Lawyers

Ayala Gómez discusses Oliva-Ayala's 2019 "Law Firm of the Year" award for criminal defense law in Spain.

Oliva-Ayala Spanish Interview

How AEQUO Is Embracing Legal Tech


by Best Lawyers

Anna Babych discusses AEQUO's 2019 Ukranian "Law Firm of the Year" award in Mergers & Acquisitions Law with Best Lawyers.

AEQUO "Law Firm of the Year" Interview

Staying Competitive in Competitions and Antitrust Law


by Best Lawyers

Igor Svechkar of Asters talks with Best lawyers about his firm's 2019 Antitrust "Law Firm of the Year" award for Ukraine.

Asters Q&A Law Firm of the Year

IN PARTNERSHIP

What Is a Criminal Defense Attorney and When Do You Need One?


by Cody Cofer

A criminal defense attorney does everything legally necessary to help you get a favorable outcome for your charges, such as a dismissal. Learn more here.

Figure standing behind prison bars

IN PARTNERSHIP

Breaking Down Criminal Conviction in Canada


by Mass Tsang

Statistics Canada’s annual breakdown of adult criminal court data provides an eye-opening review of how the country’s court system resolves its hundreds of thousands of cases annually.

Canada's Criminal Court Patterns Are Changing

IN PARTNERSHIP

Fighting Government Overreach


by John Fields

Criminal defense lawyer Dan Cogdell reflects on the Waco siege trial—a pivotal moment in his career now being revisited in a new Showtime miniseries.

Man in black suit poses for lawyer headshot

The Role of a Criminal Defense Investigator


by Best Lawyers

The role of a criminal defense investigator in a case is often overshadowed by the more prominent figures in the legal field. Let's look more closely.

Woman with hands on head stares at board of images

The Impact of Plea Bargains in Criminal Cases in the U.S.


by Best Lawyers

Best Lawyers highlights why plea bargains have risen to such prevalence, quickly becoming an essential part of the criminal justice system in the U.S.

Client and attorney stand before judge in a courtroom

8 Different Types of Criminal Defenses in Law


by Best Lawyers

Learn about the different types of criminal defenses available in law, including innocence, self-defense, insanity and more. Protect your rights today.

Silver handcuffs laying on finger printed papers

Announcing The Best Lawyers in Germany™ 2023


by Best Lawyers

The results include an elite field of top lawyers and firms from Germany.

Black, red and yellow stripes

Announcing The Best Lawyers in Switzerland™ 2023


by Best Lawyers

The results include an elite field of top lawyers and firms from Switzerland.

Red flag with white cross

Announcing The Best Lawyers in Austria™ 2023


by Best Lawyers

The results include an elite field of top lawyers and firms from Austria.

Red and white stripes

Trending Articles

Introducing the 2026 Best Lawyers Awards in Australia, Japan, New Zealand and Singapore


by Jennifer Verta

This year’s awards reflect the strength of the Best Lawyers network and its role in elevating legal talent worldwide.

2026 Best Lawyers Awards in Australia, Japan, New Zealand and Singapore

Discover The Best Lawyers in Spain 2025 Edition


by Jennifer Verta

Highlighting Spain’s leading legal professionals and rising talents.

Flags of Spain, representing Best Lawyers country

Unveiling the 2025 Best Lawyers Editions in Brazil, Mexico, Portugal and South Africa


by Jennifer Verta

Best Lawyers celebrates the finest in law, reaffirming its commitment to the global legal community.

Flags of Brazil, Mexico, Portugal and South Africa, representing Best Lawyers countries

How to Increase Your Online Visibility With a Legal Directory Profile


by Jennifer Verta

Maximize your firm’s reach with a legal directory profile.

Image of a legal directory profile

Paramount Hit With NY Class Action Lawsuit Over Mass Layoffs


by Gregory Sirico

Paramount Global faces a class action lawsuit for allegedly violating New York's WARN Act after laying off 300+ employees without proper notice in September.

Animated man in suit being erased with Paramount logo in background

The Future of Family Law: 3 Top Trends Driving the Field


by Gregory Sirico

How technology, mental health awareness and alternative dispute resolution are transforming family law to better support evolving family dynamics.

Animated child looking at staircase to beach scene

Effective Communication: A Conversation with Jefferson Fisher


by Jamilla Tabbara

The power of effective communication beyond the law.

 Image of Jefferson Fisher and Phillip Greer engaged in a conversation about effective communication

The 2025 Legal Outlook Survey Results Are In


by Jennifer Verta

Discover what Best Lawyers honorees see ahead for the legal industry.

Person standing at a crossroads with multiple intersecting paths and a signpost.

Safe Drinking Water Is the Law, First Nations Tell Canada in $1.1B Class Action


by Gregory Sirico

Canada's argument that it has "no legal obligation" to provide First Nations with clean drinking water has sparked a major human rights debate.

Individual drinking water in front of window

The Best Lawyers Network: Global Recognition with Long-term Value


by Jamilla Tabbara

Learn how Best Lawyers' peer-review process helps recognized lawyers attract more clients and referral opportunities.

Lawyers networking

New Mass. Child Custody Bills Could Transform US Family Law


by Gregory Sirico

How new shared-parenting child custody bills may reshape family law in the state and set a national precedent.

Two children in a field holding hands with parents

Jefferson Fisher: The Secrets to Influential Legal Marketing


by Jennifer Verta

How lawyers can apply Jefferson Fisher’s communication and marketing strategies to build trust, attract clients and grow their practice.

Portrait of Jefferson Fisher a legal marketing expert

Finding the Right Divorce Attorney


by Best Lawyers

Divorce proceedings are inherently a complex legal undertaking. Hiring the right divorce attorney can make all the difference in the outcome of any case.

Person at a computer holding a phone and pen

The Future of Canadian Law. Insights from Best Lawyers: Ones to Watch Honorees


by Jennifer Verta

Emerging leaders in Canada share their perspectives on the challenges and opportunities shaping the future of Canadian law

Digital eye with futuristic overlays, symbolizing legal innovation and technology

New Texas Law Opens Door for Non-Lawyers to Practice


by Gregory Sirico

Texas is at a critical turning point in addressing longstanding legal challenges. Could licensing paralegals to provide legal services to low-income and rural communities close the justice gap?

Animated figures walk up a steep hill with hand

Family Law Wrestles With Ethics as It Embraces Technology


by Michele M. Jochner

Generative AI is revolutionizing family law with far-reaching implications for the practice area.

Microchip above animated head with eyes closed