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WASHINGTON - FEBRUARY 11, 1962: (EDITORIAL USE ONLY) (FILE PHOTO) U.S. President John F. Kennedy speaks during a televised speech to the nation about the Cuban missile crisis February 11, 1962 in Washington, DC. Former Russian and U.S. officials attending a conference commemorating the 40th anniversary of the missile crisis October 2002 in Cuba said that the world was closer to a nuclear conflict during the 1962 standoff between Cuba and the U.S., than governments were aware of. (Photo by Getty Images)

WASHINGTON - FEBRUARY 11, 1962:  (EDITORIAL USE ONLY)  (FILE PHOTO)  U.S. President John F. Kennedy speaks during a televised speech to the nation about the Cuban missile crisis February 11, 1962 in Washington, DC. Former Russian and U.S. officials attending a conference commemorating the 40th anniversary of the missile crisis October 2002 in Cuba said that the world was closer to a nuclear conflict during the 1962 standoff between Cuba and the U.S., than governments were aware of.  (Photo by Getty Images)