Ex-C.I.A. Officer Suspected of Compromising Chinese Informants Is Arrested

The arrest of the former officer, Jerry Chun Shing Lee, 53, capped an intense F.B.I. investigation that began around 2012 after the C.I.A. began losing its agents in China.

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Killing C.I.A. Informants, China Crippled U.S. Spying Operations

At least 18 C.I.A. sources were killed or imprisoned in China between 2010 and 2012, one of the worst intelligence breaches in decades. Investigators still disagree about how it happened.

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How the Russia Inquiry Began: A Campaign Aide, Drinks and Talk of Political Dirt

George Papadopoulos, a Trump foreign policy adviser, was the improbable match that set off a blaze that has consumed the first year of the Trump administration.

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Security Breach and Spilled Secrets Have Shaken the N.S.A. to Its Core

A serial leak of the agency’s cyberweapons has damaged morale, slowed intelligence operations and resulted in hacking attacks on businesses and civilians worldwide.

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After a Disciplined Week in Asia, Trump Unloads on Critics

In a stream of tweets, he called those raising questions about Russia “haters and fools” and said he could call North Korea’s leader “short and fat.”

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ISIS Fighters Are Not Flooding Back Home to Wreak Havoc as Feared

Several factors contributed: The American-led campaign in Iraq and Syria focused on preventing militants from leaving, and many fought to the death.

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