Cuban Missile Crisis forces. Kennedy met with members of EXCOMM and other top advisers throughout October 21, considering two remaining options: an air strike primarily against the Cuban missile bases or a naval blockade of Cuba. A full-scale invasion was not the administration's first option. McNamara supported the naval blockade as a strong but limited military action that left the US in control. The term "blockade" was problematic. According to international law, a blockade is an act of war, but the Kennedy administration did not think that the Soviets would be provoked to attack by a mere blockade. Additionally, legal experts at the
Cuban Missile Crisis fire only on groups of two or more. At 6:00 am EDT on October 27, the CIA delivered a memo reporting that three of the four missile sites at San Cristobal and the two sites at Sagua la Grande appeared to be fully operational. It also noted that the Cuban military continued to organize for action but was under order not to initiate action unless attacked. At 9:00 am EDT on October 27, Radio Moscow began broadcasting a message from Khrushchev. Contrary to the letter of the night before, the message offered a new trade: the missiles on Cuba would