[10] Robert M. Gates, “Commencement Address,” University of Notre Dame, 22 May 2011. http://news.nd.edu/news/18227-secretary-of-defense-robert-gates-selected-as-2011-commencement-speaker/

[11] Robert M. Gates, Duty: Memoirs of a Secretary at War (New York: Alfred A. Knopf, 2014), 590.

[12] Eli Lake, “Putin’s Bluff? U.S. Spies Say Russia Won’t Invade Ukraine,” The Daily Beast, 27 February 2014. Available at http://www.thedailybeast.com/articles/2014/02/27/u-s-spies-no-russia-isn-t-about-to-invade-ukraine.html