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"The legacy of this character is just astonishing," he said.

"This is a big shift in North Korea's governing technique and shows Kim Jong Un's astonishing ability to adapt and control the narrative".

If true, the figure would indeed be astonishing, potentially tripling the roughly $4tn in gross private investment the US reported all of last year.

It capped an astonishing week for the mother-of-two, who dropped just one set across seven matches in nine days.

The judges called the book an "astonishing debut... a masterful blend of history, suspense and historical authenticity".