This set of NSAThe Powerful Global Spy Alliance You Never Knew Existed, 1 March 2018.
This 12 August 2010 post from the NSA’s internal newsletter SIDToday describes the outcomes of the annual Sigint Seniors Europe (SSEURP) conference, which agreed in principle to increase information sharing: see the Intercept article The Powerful Global Spy Alliance You Never Knew Existed, 1 March 2018.
This internal NSA briefing document from 19 April 2014 supplies background information for a Strategic Planning Meeting with senior BND officers to discuss future collaboration between Germany and the US: see the Der Spiegel article Spying Together: Germany’s Deep Cooperation with the NSA, 18 June 2014.
This background document, prepared by NSA officials in advance of a conversation with representatives of Germany’s domestic (BfV) and foreign (BND) intelligence services, outlines the continuing cooperation between the three agencies in the field of counterterrorism. Extracts from this document were published by Der Spiegel in July 2013: see the Der Spiegel article New NSA Revelations: Inside Snowden’s Germany File, 18 June 2014.
This internal NSA document from April 2013 gives background information to prepare for the then GCHQ Director’s visit on 30 April and 1 May; included topics include access to PRISM data, FLAME malware, Iran, Syria and Israel: see the Intercept article British Spy Chiefs Secretly Begged to Play in NSA’s Data Pools, 30 April 2014.
This short excerpt from an NSA document shows that nine European States – Belgium, Denmark, France, Germany, Italy, The Netherlands, Norway, Spain and Sweden – have a second-tier ‘third party’ relationship with the agency: see the SVT article NSA “asking for” specific exchanges from FRA – Secret treaty since 1954, 8 December 2013.