The FBI says it opens a new counter-intelligence case against China every 10 hours. The FT’s US defence correspondent Katrina Manson looks at the espionage war between Washington and Beijing. See if you get the FT for free as a student (http://ft.com/schoolsarefree) or start a £1 trial: https://subs.ft.com/spa3_trial?segmentId=3d4ba81b-96bb-cef0-9ece-29efd6ef2132
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