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As one former senior intelligence official noted, romantic and social entanglements remain one of the most effective and frequently exploited tools in the arsenal of Chinese espionage. When an individual in a sensitive position fails to disclose such a connection, the damage is twofold: it compromises the individual through potential blackmail or influence, and it exposes classified communication channels to foreign oversight. The fact that Choi acknowledged his partner could be a spy suggests he was aware of the high probability that his private life was being used as a gateway for intelligence gathering.
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