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Nataliia Bertagna

Nataliia Bertagna

Managing Associate

Profile

Nataliia is a Managing Associate in the International Arbitration team. Her practice covers both investment treaty and commercial arbitrations, with a focus on the energy, construction, mining and telecommunications sectors. Nataliia has acted for companies and sovereign states from around the globe, with a particular focus on Africa, Eastern Europe, Central Asia and the Middle East. She has particularly significant experience acting for and against sovereign states. Nataliia has been recognised as a Future Leader in Arbitration in the Lexology Index 2026.

Nataliia has been involved in international arbitrations under most of the major institutional rules (ICSID, ICC, LCIA, SCC and UNCITRAL), as well as in ad hoc arbitrations. She also has experience of dispute board proceedings, annulment and enforcement proceedings, as well as cross-border litigation.

Trained in both civil and common law, Nataliia is admitted to practise in England, France, Ukraine and before the Astana International Financial Centre (AIFC) Court in Kazakhstan. She is fluent in English, French, Ukrainian and Russian.

She maintains an active pro bono practice focusing on public international law and human rights and is recognised in the 2026 Pro Bono Recognition List of England & Wales for her work with the Public International Law & Policy Group (PILPG), a global pro bono law firm, on a series of Ukraine-related projects. Nataliia serves on the Board of the International Law Committee of the Ukrainian Bar Association.

Prior to joining Mishcon de Reya, Nataliia practised in the international arbitration group of a global law firm in London and Paris.

More Details

Key Experience

Investment treaty arbitration

  • Advising an energy consortium on potential investment treaty claims arising from EU regulatory measures affecting a multibillion-dollar energy investment
  • Advising a global consumer goods business on potential investment treaty claims arising from arbitrary tax and customs measures
  • Represented the Kingdom of Saudi Arabia in PCCW Cascade (Middle East) Ltd. v. Kingdom of Saudi Arabia (ICSID Case No. ARB/22/20), brought under the China-Saudi Arabia BIT in relation to an investment in the telecom sector
  • Represented Georgia in Gardabani Holdings B.V. and Silk Road Holdings B.V. v. Georgia (ICSID Case No. ARB/17/29), involving parallel contract and treaty (Netherlands-Georgia BIT) arbitrations relating to a dispute concerning electricity tariffs, as well as in related court proceedings in multiple jurisdictions
  • Acted for Ukraine in Emergofin B.V. and Velbay Holdings Ltd. v. Ukraine (ICSID Case No. ARB/16/35), brought under the Netherlands-Ukraine BIT concerning measures affecting an aluminium and alumina production business

Commercial and construction arbitration

  • Acting for a State in a multibillion-dollar dispute with an international consortium concerning an onshore oil and gas field in Central Asia
  • Advising an operator of a petrochemical complex in Central Asia on a dispute with its EPC contractor, including related performance bond claims
  • Acted for a West African State and State agency in a USD 700 million dispute in London and Paris with sponsors and lenders regarding a project in the water sector
  • Acted for a global digital asset company in LCIA and ICC arbitrations seated in London and Geneva arising from high-value sponsorship agreements with a Premier League football club governed by English law and Spanish law
  • Represented a contractor in multiple Dispute Board proceedings concerning a water infrastructure project in Kosovo under the International Federation of Consulting Engineers (FIDIC) 2017 Red Book, governed by Kosovan law
  • Represented a public entity responsible for Georgia’s national road infrastructure in multiple Dispute Board proceedings and ICC arbitrations seated in Paris arising from road construction projects under the FIDIC 2010 Pink Book, governed by Georgian law
  • Acted for a State in a Paris-seated ICC arbitration concerning the construction of sports facilities

Commercial litigation and enforcement

  • Acted as global enforcement counsel to a sovereign client, coordinating the recognition and enforcement of international arbitral awards across multiple jurisdictions, including France, Italy, Ukraine, Turkmenistan and Kazakhstan. Obtained an ex parte judgment from the Astana International Financial Centre (AIFC) Court recognising and enforcing a foreign arbitral award in Kazakhstan
  • Acted for a public infrastructure entity in commercial litigation against a bank concerning on-demand bank guarantees governed by the ICC Uniform Rules for Demand Guarantees (URDG 758)
  • Represented a public infrastructure entity before the liquidation committee of a Central Asian commercial bank
  • Advised a State on the settlement of investment arbitration claims and coordinated the post-settlement suspension of enforcement proceedings before the courts of Cyprus, the UAE and the District of Columbia

Career History

Associate, White & Case LLP
Trainee, Shearman & Sterling LLP
Barrister’s Assistant, Littleton Chambers
Mini-pupil, Fountain Court Chambers
Mini-pupil, 3 Verulam Buildings
Trainee, Embassy of Ukraine to the United Kingdom
Associate, MORIS Law Firm
Investigator, Ministry of Internal Affairs of Ukraine, Regional Office
National Academy of Interior Affairs, PhD
University College London (UCL), LLM
University of Law, GDL
Lviv State University of Internal Affairs, BA and MA

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