Apparently some are unaware. According to this article in today's edition of the New Yorker.  The informed author says his "greatest concern is the lack of public awareness about this existential threat, the absence of a vigorous public debate about the nuclear-war plans of Russia and the United States, the silent consent to the roughly fifteen thousand nuclear weapons in the world."  

http://www.newyorker.com/news/news-desk/world-war-three-by-mistake