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Kenya had earlier said it had been denied access to Boniface Mwangi and expressed concern over his health.
The UK had been due to hand over the islands to the Mauritian government.
The BBC's Gary O'Donoghue analyses how the South African president reacted in an extraordinary Oval Office meeting.
Right-wing Afrikaners groups celebrated the ambush but others in the Rainbow Nation found it "uncomfortable" to watch.
Cyril Ramaphosa rebuts discredited claims of a "white genocide" in South Africa, as US president confronts him in Oval Office.
The US and UK will maintain a key military base on the island for 99 years, under the multi-billion pound deal.
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