'A mystery wrapped in an enigma,' Sir Winston Churchill's aphorism about Russia, was recently borrowed by the United States Secretary of State John Foster Dulles to describe the position of high altitude flights in international law. This was at a news conference1 held two days after the United States had received a protest from the Soviet Union against the flight of balloons, released by United States military organs and other organizations, over Soviet territory. As the United States reply of 8 February 1956 recalled, details of a United States Air Force...
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