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 2005 post from the NSA’s internal newsletter SIDToday describes how the relationship between the agency and its Czech counterpart USZI developed into a “third party relationship”: see the Intercept article NSA Used Porn to “Break Down Detainees” in Iraq — and Other Revelations From 297 Snowden Documents, 1 March 2018.
This October 2005 article, taken from the internal NSA newsletter Foreign Affairs Digest, provides a brief history of the agency’s past and current relationship with its Turkish counterparts, which includes a staff of 40 NSA employees stationed in Ankara: see the Intercept article How the NSA Helped Turkey Kill Kurdish Rebels, 31 August 2014.
This memorandum dated 6 July 2005 describes features of the intelligence sharing systems that preceded ICREACH: see the Intercept article The Surveillance Engine: How the NSA Built Its Own Secret Google, 25 August 2014.
This NSA information paper dated 8 April 2013 details the agency’s deepening signals intelligence relationship with Saudi Arabia: see the Intercept article The NSA’s New Partner in Spying: Saudi Arabia’s Brutal State Police, 25 July 2014.
This NSA classification guide, dated 21 November 2011, covers signals intelligence material that as to be kept secret for more than the standard 60 years: see the Der Spiegel article The NSA in Germany: Snowden’s Documents Available for Download, 18 June 2014.
This article from the internal NSA newsletter Foreign Affairs Digest, dated 10 June 2005, marks the one-year anniversary of the US Special Liaison Activity Germany (SUSLAG) – NSA personnel working on German soil: see the Der Spiegel article New NSA Revelations: Inside Snowden’s Germany File, 18 June 2014.