The tuna bond or "hidden debt" case has triggered criminal investigations from Maputo to New York, plus a series of linked lawsuits in London involving Credit Suisse, shipbuilder Privinvest, its owner Iskandar Safa and many others.

Privinvest and Safa tried to drag Nyusi into the case, arguing he should contribute to any damages they may be ordered to pay if they are found liable to Mozambique, but the High Court ruled on Monday that Nyusi is entitled to state immunity.

(Reporting by Sam Tobin, Editing by Kylie MacLellan)