Among the slumbering passengers on an overnight flight from Miami to Munich last month were two travelers on opposing sides of an espionage takedown.
In one seat was a German citizen who would be arrested upon arrival and charged with treason for helping Russia recruit and run a Kremlin mole in the upper ranks of Germany's intelligence service. Seated nearby was an FBI agent who had boarded the flight to surreptitiously monitor the suspected operative, according to Western security officials, and make sure that he was taken into custody by German authorities.