<prompt> Translate the following text to EnglishRais wa Marekani John F. Kennedy aliweka kizuizi cha majini juu ya kisiwa hicho ili kuhakikisha kwamba makombora zaidi hayangefika na alisisitiza kwamba yale yaliyopo yaondolewe.  <response>: 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. 