Most comprehensible research I have ever found on early NATO expansion negotiations - long read if you try to make sense of declassified documents:
Savranskaya, Svetlana, and Tom Blanton. (2017) “NATO Expansion: What Gorbachev Heard.” 12 December 2017. The National Security Archive Website.
->
https://nsarchive.gwu.edu/briefing-b...-leaders-early
more sources below [if anyone cares to have a summary plus argument, pm me - I will send you my semester paper (2019)]
References:
Berryman, John. (2011) “Russia, NATO Enlargement, and “Regions of Privileged Interests”. In Kanet, Roger (Ed.): Russian Foreign Policy in the 21st Century. 228-245. Springer.
Congressional Research Service (CRS). (2019) “U.S. Sanctions on Russia: An Overview.” CRS Website. <https://crsreports.congress.gov/product/pdf/R/R45415> European Statistical Office (Eurostat). (2018)
“EU Imports of Energy Products – Recent Developments.” Eurostat website. <https://ec.europa.eu/eurostat/statistics-explained/pdfscache/46126.pdf>
Götz, Elias. (2015) “It’s Geopolitics, Stupid: Explaining Russia’s Ukraine Policy.” Global Affairs 1.1: 3-10. <https://www.tandfonline.com/doi/pdf/10.1080/23340460.2015.960184>
Götz, Elias. (2016) “Russia, the West, and the Ukraine Crisis: Three Contending Perspectives.” Contemporary politics 22.3: 249-266. <https://www.tandfonline.com/doi/full/10.1080/13569775.2016.1201313>
Hutcheson, Derek S. and No Petersson. (2016) “Shortcut to Legitimacy: Popularity in Putin’s Russia.” Europe-Asia Studies 68.7: 1107-1126. <https://www.tandfonline.com/doi/full/10.1080/09668136.2016.1216949>
Kissinger, Henry A. (2016) “Kissinger’s Vision for US-Russia Relations.” The National Interest. 4 February 2016. <https://nationalinterest.org/feature/kissingers-vision-us-russia-relations-15111>
Kofman, Michael, and Matthew Rojansky. (2018) “What Kind of Victory for Russia in Syria?” Military Review 24: 6-23. <https://www.armyupress.army.mil/Portals/7/military-review/Archives/English/Rojansky-Victory-for-Russia-1.pdf>
Krug, Christian, and Kalina Oroschakoff. (2017) “Germany and Austria Warn US Over Expanded Russia Sanctions.” POLITICO Europe Website. 15 June. <https://www.politico.eu/article/germany-and-austria-warn-u-s-over-expanded-russia-sanctions>
Lavrov, Sergey V. (2016) “Russia’s Foreign Policy in a Historical Perspective.” Russia in Global Affairs 14(2). <https://eng.globalaffairs.ru/number/Russias-Foreign-Policy-in-a-Historical-Perspective-18067>
Mankoff, Jeffrey, and Andrew Kuchins. (2015) “Russia, Ukraine, and US Policy Options: A Briefing Memo.” Center for Strategic and International Studies 29. <http://csis.org/files/publication/150129_Mankoff_RussiaUkraineUSOptions_Web.pdf>
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Matlary, Janne Haaland. (2018) Hard Power in Hard Times: Can Europe Act Strategically? Springer.
NATO Membership Action Plan (MAP). (1999) NATO Press Release NAC-S(99)66. 24 April 1999. NATO Website. <https://www.nato.int/docu/pr/1999/p99-066e.htm>
Nygren, Bertil. (2011) “Russia and Georgia – From Confrontation to War: What is Next?” In Kanet, Roger (Ed.): Russian Foreign Policy in the 21st Century. 101-120. Springer.
Obama, Barack. (2010) National Security Strategy of the United States of America. National Security Strategy Archive. <http://nssarchive.us/national-security-strategy-2010/>
Obama, Barack. (2015) National Security Strategy of the United States of America. National Security Strategy Archive <http://nssarchive.us/national-security-strategy-2015/>
Oldberg, Ingmar. (2011) “Aims and Means in Russian Foreign Policy.” In Kanet, Roger (Ed.): Russian Foreign Policy in the 21st Century. 30-58. Springer.
Putin, Vladimir. (2000) Foreign Policy Concept of the Russian Federation. Federation of American Scientist Website. <https://fas.org/nuke/guide/russia/doctrine/econcept.htm>
Putin, Vladimir. (2007) “Speech and the Following Discussion at the Munich Conference on Security Policy.” Transcript. President of Russia Website. 12 February 2007. <http://en.kremlin.ru/events/president/transcripts/24034>
Putin, Vladimir. (2008) Foreign Policy Concept of the Russian Federation. President of Russia Website. <http://en.kremlin.ru/supplement/4116>
Putin, Vladimir. (2016) Foreign Policy Concept of the Russian Federation. Ministry of Foreign Affairs Website. <http://www.mid.ru/foreign_policy/news/-/asset_publisher/cKNonkJE02Bw/content/id/2542248?p_p_id=101_INSTANCE_cKNonkJE02Bw&_101_INST ANCE_cKNonkJE02Bw_languageId=en_GB>
Savranskaya, Svetlana, and Tom Blanton. (2017) “NATO Expansion: What Gorbachev Heard.” 12 December 2017. The National Security Archive Website. <https://nsarchive.gwu.edu/briefing-book/russia-programs/2017-12-12/nato-expansion-what-gorbachev-heard-western-leaders-early>
Sergunin, Alexander. (2016) Explaining Russian Foreign Policy Behavior: Theory and Practice. Vol. 147. Columbia University Press. Shearman, Peter. (2011) “History, Russia and the West, and Cold Wars.” In Kanet, Roger (Ed.): Russian Foreign Policy in the 21st Century. 11-29. Springer.
Stoltenberg, Jens. (2019) “Press conference by NATO Secretary General Jens Stoltenberg following the Meeting of the NATO-Russia Council”. 25 January 2019. NATO Website. <https://www.nato.int/cps/en/natohq/opinions_162658.htm>
Trenin, Dmitri. (2009) “Russia’s Spheres of Interest, not Influence.” The Washington Quarterly 32.4: 3-22. <https://www.tandfonline.com/doi/abs/10.1080/01636600903231089>
Trump, Donald J. (2017) National Security Strategy of the United States of America. National Security Strategy Archive. <http://nssarchive.us/national-security-strategy-2017/>
The Moscow Times. (2019) “Trump Extends U.S. Sanctions Against Russia Over Crimea.” The Moscow Times Website. 5 March 2019. <https://www.themoscowtimes.com/2019/03/05/trump-extends-us-sanctions-against-russia-over-crimea-a64711>
Ziegler, Charles E. (2016) “Russia on the Rebound: Using and Misusing the Responsibility to Protect.” International Relations 30.3: 346-361. <
https://journals.sagepub.com/doi/full/10.1177