US president John F. Kennedy imposed a naval blockade on the island to ensure no more missiles arrived and insisted that the existing ones be removed.
US president John F. Kennedy imposed a naval blockade on the island that ended with removal and sanctions. 
mnli hypothesis: US president John F. Kennedy imposed a naval blockade on the island that ended with removal and sanctions.  premise: US president John F. Kennedy imposed a naval blockade on the island to ensure no more missiles arrived and insisted that the existing ones be removed.