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Story summary
- MI5 chief Ken McCallum said the United Kingdom thwarted a Chinese espionage attempt, underscoring Beijing's threat.
- He expressed frustration over prosecutors dropping the high-profile spying case against Christopher Cash and Christopher Berry.
- He said investigations into state threats rose 35% in the past year, with concerns about China, Russia, and Iran.
- The agency must defend the UK while navigating international relations and is adapting to a hostile environment since 9/11.
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