Nigeria's President Bola Tinubu looks on after his swearing-in ceremony in Abuja, Nigeria May 29, 2023.
The sum had since swelled with interest to over $11 billion, representing 10 times the country's 2019 health budget.
The judge said a further hearing would take place to decide whether to send the case back to arbitration or ditch the $11 billion award without further delay.
Both received confidential Nigerian documents during the arbitration that they knew they were not entitled to see, the judge found.
Additional reporting by Felix Onuah in Abuja, Editing by Estelle Shirbon and David EvansOur Standards: The Thomson Reuters Trust Principles.
Persons:
Bola Tinubu, Temilade, Tinubu, Robin Knowles, Knowles, Nigeria's, Trevor Burke, Seamus Andrew, Burke, Andrew, Felix Onuah, Estelle Shirbon, David Evans
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Locations:
Abuja, Nigeria, British Virgin Islands, Nigerian, Africa