This June 2010 NSA presentation for the SIGDEV conference describes efforts to trace a suspected Chinese cyber attack: see the Der Spiegel article The Digital Arms Race: NSA Preps America for Future Battle, 17 January 2015.

This agreement, dated 15 July 1999, includes a preamble describing the development of signals intelligence cooperation between the US and Israel since the 1950s: see the Intercept article Cash, Weapons and Surveillance: the U.S. is a Key Party to Every Israeli Attack, 4 August 2014.