On reading a biography of Khrusechev, specifically the part dealing with the set-up for the Cuban Missile Crisis, one of the points the author made is that the Soviets didn't have to make the missle placement in Cuba a secret. Apparently, even Castro himself thought that, as this was a perfectly legal move by the Soviets, that they should do this in the open. So, what if Khrusechev had gone this route, publicly announcing that Cuba requested military assistance (or something) and ferried the missiles there?