In May 1960, the USSR shot down a US spy plane trespassing in their airspace, & the Soviets captured its American pilot, Francis Gary Powers. This international incident increased tensions between the superpowers, & it spoiled peace negotiations between President Dwight Eisenhower & Soviet Premier Nikita Khrushchev. However, the Americans did eventually succeed in negotiations to get the Soviets to release the imprisoned Powers, by agreeing to return a Russian spy in US custody. By the early 60s, both superpowers began scaling back nuclear testing within their borders due to growing concerns about the impact of atomic fallout. Unfortunately, this development came too late for tens of thousands of "downwinders" in the American West, who had already been exposed to radiation that endangered their long-term health. By the end of Ike's administration, the USA was increasing its financial & military support for a troubled regime in South Vietnam. Eisenhower ended his presidency with a speech that expressed concern over the growing "military-industrial complex," which was a monster that his own policies had helped to create.