CIA mourns 'most valuable' KGB defector

A KGB spy who switched allegiances at the height of the Cold War and was considered by the CIA as its “most valuable and economical defector” has died.

CIA mourns 'most valuable' KGB defector

A KGB spy who switched allegiances at the height of the Cold War and was considered by the CIA as its “most valuable and economical defector” has died.

Yuri Ivanovich Nosenko defected in Switzerland in 1964.

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