Killing C.I.A. Informants, China Crippled U.S. Spying Operations (nytimes.com)

Maybe the OPM data breach [1] started earlier (2010) than claimed (2014). It was detected in April 2015 and said to have started just one year earlier, with some uncertainty.

[1] https://en.wikipedia.org/wiki/Office_of_Personnel_Management...