<P> Ellsberg said that Robert Kennedy (RFK) told him in 1964 that after the U-2 was shot down and the pilot killed, he (RFK) told Soviet ambassador Dobrynin, "You have drawn first blood...(T) he president had decided against advice...not to respond militarily to that attack, but he (Dobrynin) should know that if another plane was shot at,...we would take out all the SAMs and antiaircraft...And that would almost surely be followed by an invasion ." </P> <Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2017) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2017) (Learn how and when to remove this template message) </Td> </Tr> <P> Emissaries sent by both Kennedy and Khrushchev agreed to meet at the Yenching Palace Chinese restaurant in the Cleveland Park neighborhood of Washington, DC, on Saturday evening, October 27 . Kennedy suggested to take Khrushchev's offer to trade away the missiles . Unknown to most members of the EXCOMM, Robert Kennedy had been meeting with the Soviet Ambassador Dobrynin in Washington to discover whether the intentions were genuine . The EXCOMM was generally against the proposal because it would undermine NATO's authority, and the Turkish government had repeatedly stated it was against any such trade . </P>

Explain the concept blockade in the context of the deployment of missiles in cuba