I still think that it would have be quite possible to present a supportive attitude towards the new Cuban regime as being a way of challenging the Soviet ownership of Third World leftism, analogous to the way Tito's Yugoslavia was accommodated.

Is it too cynical to suspect that the crucial issue may not have been Cold War politics so much as the influence of powerful people who had lost out in the Cuban regime change?
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I doubt if Kruschev's rivals were ignorant of the counter-concession about Turkish missiles. Publicising it might have helped Communist parties in Italy and France perhaps.