Donald Trump created a diplomatic storm earlier this month by speaking on the telephone to Taiwan's leader - the first such official communication since 1979. He then suggested he might ditch US adherence to the One China policy - a bedrock of ties between the two world powers. Does he really mean to change US policy and if so what will the consequences be for US-China ties? Ben Hall puts the question to the FT's James Kynge and Demetri Sevastopulo.

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