Winston Churchill's often quoted observation that the Soviet Union "is a riddle wrapped in a mystery inside an enigma" would appear to have some validity even today. In any case the confrontational nature of relations between the United States and the Soviet Union make it prudent to follow the good advice of an even older strategist, Sun Tzu, that it is necessary to "...know one's enemy" if success is to be assured.
McCausland, Jeffrey D.
"The SS-20: A Range of Choices,"
Naval War College Review: Vol. 36
, Article 10.
Available at: https://digital-commons.usnwc.edu/nwc-review/vol36/iss6/10