Tim Marshall was a foreign correspondent for decades. He was well-known as the diplomatic editor and the foreign editor of Sky News.

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Since then, his book ' Prisoners of Geography' became instantly successful and a huge bestseller. His sequel, 'The Power of Geography' is out this week.

Tim talks to Krishnan about the UK's current place on the world stage, how much power China has and how space is the new frontier for political negotiations.

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