Final answer:
The tone of Khrushchev's letter to Kennedy was direct and confrontational, as seen in his responses during the Cuban Missile Crisis.
Explanation:
The tone of Khrushchev's letter to Kennedy was direct and confrontational. This can be seen in Khrushchev's response to Castro's criticism about peaceful coexistence with the West, where he asked, "What did you expect them to send you? Presents?" This indicates a blunt and assertive tone.
Additionally, in the context of the Cuban Missile Crisis, Khrushchev's decision to secretly send missiles armed with nuclear weapons to Cuba shows a defiant and aggressive stance towards the United States, further reflecting the tone of his actions during that period.
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