The Red Threat : President Orders Cuban Blockade President John F. Kennedy imposes a naval and air 'quarantine' on the shipment of offensive military equipment to Cuba. In a speech of extraordinary gravity, he tells the American people that the Soviet Union, contrary to promises, is building offensive missile and bomber bases in Cuba that could fire nuclear warheads up to 2,000 miles. He calls the Russians responsible and says the U.S. would retaliate. MS President Kennedy sitting at desk speaking (natural audio of speech). President Kennedy seen in office with Andrei Gromyko. Flags outside the United Nations.