Aija Lejniece

  • 45, rue Saint-Dominique
  • Paris 75007
  • France

Aija Lejniece is an associate in the Paris office of Latham & Watkins. Ms. Lejniece works within the Litigation & Trial Department in the firm’s International Arbitration Practice.

Ms. Lejniece’s work focuses on public international law, international investment arbitration, and international commercial arbitration. She advises companies, States, and State-owned entities in high-stake, complex disputes and has experience representing clients in both institutional and ad hoc arbitration under the major arbitral rules including UNCITRAL, LCIA, ICSID, and ICC. Her experience includes representing clients in disputes in Europe, Latin America, and eastern Europe. She has particular experience representing CIS States and State-owned entities in investment treaty disputes, and acting as counsel in arbitrations brought pursuant to the Energy Charter Treaty.

Prior to joining Latham in 2016, Ms. Lejniece was an associate at a leading international law firm, where she represented States and State-owned enterprises in complex investment treaty arbitrations in the energy sector.


Ms. Lejniece’s experience includes representing:

  • A sovereign party in an investor-State dispute under the UNCITRAL Rules concerning a bank rescue program arising out of the financial crisis.
  • A European company in a Stockholm Chamber of Commerce arbitration brought under the Energy Charter Treaty and seated in Stockholm against the Kingdom of Spain, concerning changes in the photovoltaic sector introduced by the Spanish government.
  • A State-owned oil and gas company as the respondent in two LCIA arbitrations seated in London brought by a subsidiary of a North American oil and gas company in connection with a dispute arising from a Unit Operating Agreement.
  • A sovereign party against a North American investor in an ICSID arbitration relating to regulatory changes and environmental protection in the mining sector.
  • The Russian Federation in three parallel UNCITRAL arbitrations and subsequent annulment proceedings before the Hague District Court. The claims were brought under the Energy Charter Treaty commenced by one Isle of Man and two Cypriot companies, in their capacities as former majority shareholders of Yukos Oil Company.*
  • A sovereign party in three related UNCITRAL arbitrations brought under the Energy Charter Treaty in relation to an alleged expropriation of subsidiary company interests in the parent company.*
  • OJSC Tatneft in an UNCITRAL arbitration and the subsequent challenge of the award before the Paris Court of Appeals. The claims were brought under the Russia-Ukraine bilateral investment treaty and arose out of a raider takeover of the largest refinery in Ukraine.*
  • OAO Gazprom in an UNCITRAL arbitration against the Republic of Lithuania under the Russia-Lithuania bilateral investment treaty concerning the forced divestiture of the natural gas transmission operations and assets of AB Lietuvos Dujos, the largest integrated natural gas distribution company in Lithuania. OAO Gazprom was a shareholder in AB Lietuvos Dujos.*
  • The Hellenic Republic in an ICSID arbitration brought by Cypriot investor for alleged violations of the Hellenic Republic-Cyprus bilateral investment treaty concerning measures taken by the Hellenic Republic to address its financial crisis.*

*Matter handled prior to joining Latham


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