Materials arranged chronologically.
Lichtblau, Eric, and David E. Sanger. "State Dept. Official Arrested in Inquiry on Taiwan Contact." New York Times, 16 Sep. 2004. [http://www.nytimes.com]
According to law enforcement and intelligence officials, Donald W. Keyser, a former "ranking official on East Asian affairs" at the State Department, was arrested on 15 September 2004. He is "charged with concealing a trip to Taiwan, and is suspected of improperly passing documents to Taiwanese intelligence agents.... F.B.I. agents in the bureau's Washington field office are investigating the case as possible espionage." See also, Jerry Markon, "Powell Aide Gave Papers to Taiwan, FBI Says," Washington Post, 16 Sep. 2004, A1.
Morello, Carol. "Arrest Shocks Former State Department Colleagues: Highly Regarded Expert on Asia Is Accused of Passing Documents and Taking Secret Trip to Taiwan." Washington Post, 17 Sep. 2004, A8. [http://www.washingtonpost.com]
According to an affidavit filed on 15 September 2004 in U.S. District Court in Alexandria, Donald W. Keyser "was released on $500,000 bond on a charge of lying about [a] trip to Taiwan on an official government document." The affidavit "said that Keyser made the unsanctioned trip after official visits to China and Japan and that he met" a Taiwanese agent, "a 33-year-old woman, in Taipei."
Waterman, Shaun. "U.S. Diplomat Pleads to Secrecy Charges." United Press International, 12 Dec. 2005. [http://www.upi.com]
Donald Keyser pleaded guilty on 12 December 2005 "to mishandling classified documents and lying about his relationship with a Taiwanese intelligence officer." He is scheduled for sentencing in February 2006. According to a plea agreement, Keyser had a personal relationship between 2002 and 2004 with "Isabelle Cheng, an employee of [Taiwan's] espionage agency, the National Intelligence Bureau."
Lefebvre, Stéphane. "The Case of Donald Keyser and Taiwan's National Security Bureau." International Journal of Intelligence and Counterintelligence 20, no. 3 (Fall 2007): 512-526.
This article furnishes a quick walkthrough of the Keyser case. Lefebvre's conclusion is that "Keyser seems to have been a target of opportunity who presented himself vulnerably due to his infatuation with Cheng. Or did Isabelle Cheng purposefully target him after spotting his fondness for her?"
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