Letter from Fidel Castro to Nikita Khrushchev
October 26, 1962
Dear Comrade Khrushchev:
I would like to briefly express my own personal opinion.
If the second variant takes place and the imperialists invade Cuba with the aim of occupying it, the dangers of their aggressive policy are so great that after such an invasion the Soviet Union must never allow circumstances in which the imperialists could carry out a nuclear first strike against it.
I tell you this because I believe that the imperialists' aggressiveness makes them extremely dangerous, and that if they manage to carry out an invasion of Cuba -- a brutal act in violation of universal and moral law -- then that would be the moment to eliminate this danger forever, in an act of the most legitimate self-defense. However harsh and terrible the solution, there would be no other.
Link:
Letter from Castro to Khrushchev, 10/26/62 . JFK . WGBH American Experience | PBS
Letter from Nikita Khrushchev to Fidel Castro
October 30, 1962
Dear Comrade Fidel Castro:
In your cable of October 27 you proposed that we be the first to carry out a nuclear strike against the enemy's territory. Naturally you understand where that would lead us. It would not be a simple strike, but the start of a thermonuclear world war.
Dear Comrade Fidel Castro, I find your proposal to be wrong, even though I understand your reasons.
Link:
Letter from Khrushchev to Castro, 10/30/62 . JFK . WGBH American Experience | PBS