Final answer:
The correct answer is option 1: Removed the missiles from Cuba.
Step-by-step explanation:
After Khrushchev sent the ships back, Soviet Premier Khrushchev agreed to remove all missiles from Cuba, and this was followed by the disassembly of the Cuban missile sites. President John F. Kennedy, in return, agreed not to invade Cuba and also secretly agreed to remove U.S. missiles from Turkey.
Negotiations thus played a critical role in the peaceful resolution of the Cuban Missile Crisis, averting what could have potentially escalated into a nuclear war.