cfr.org/articles/the-united-states-discovers-soviet-missiles-in-cuba The United States Discovers Soviet Missiles in Cuba
A Soviet defector's smuggled photographs helped U.S. analysts confirm nuclear missiles in Cuba on October 15, 1962, just hours before his own arrest. The discovery, delivered mid-dinner to Washington's top officials, triggered the crisis's opening night.
— via CFR (Council on Foreign Relations)
