Kennedy realized that he would be in an "insupportable position...

Kennedy realized that he would be in an "insupportable position if this becomes Khrushchev's proposal", because, number 1. The missiles in Turkey were not militarily useful and were being removed anyway. And number 2, "it's gonna – to any man at the United Nations or any other rational man, it will look like a very fair trade." National Security Adviser George McBundy explained why Khrushchev's public acquiescence could not be considered: "The current threat to peace is not in Turkey, it is in Cuba."[63]

source
http://en.wikipedia.org/wiki/Cuban_missile_crisis

guess it depends how you look at it but this is obviously from the horse's mouth