1. Akimenko, V. 2018. ‘Ukraine’s Toughest Fight: The Challenge of Military Reform’. Washington, DC: Carnegie Endowment for International Peace. https://carnegieendowment.org/2018/02/22/ukraine-s-toughest-fight-challenge-of-military-reform-pub-75609.
2. Albright, M. 1997a. ‘Statement at the North Atlantic Council Special Ministerial Meeting’. Brussels. 18 Feb 1997. https://www.nato.int/docu/speech/1997/s970218a.htm.
3. Albright, M. 1997b. ‘Statement before the Senate Armed Services Committee’. Washington, DC: US Department of State. 23 April 1997. https://1997-2001.state.gov/statements/970423.html.
4. Art, R.J. 1996. Why Western Europe Needs the United States and NATO. Political Science Quarterly 111 (1): 1–39.
5. Asmus, R.D., R.L. Kugler, and F.S. Larrabee. 1995. NATO Expansion: The Next Steps. Survival 37 (1): 7.