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 of reporting provided by Oleg Penkovsky, a double agent in the GRU working for CIA and MI6. Although he provided no direct reports of the Soviet missile deployments to Cuba, technical and doctrinal details of Soviet missile regiments that had been provided by Penkovsky in the months and years prior to the Crisis helped NPIC analysts correctly identify the missiles on U-2 imagery. That evening, the CIA notified the Department of State and at 8:30 pm EDT, Bundy chose to wait until the next morning to tell the President. McNamara was briefed at midnight. The next morning, Bundy met with