John Leung, an unlikely spy who was known as a former restaurant owner and organizer, was a vital informant for the F.B.I. in gathering intelligence on China.
After being sentenced to life in prison for espionage, John Leung was released in a rare U.S.-China prisoner swap, marking a significant diplomatic event.
In exchange for Leung and others, the U.S. released Xu Yanjun, a convicted Chinese spy, highlighting the complexities of U.S.-China relations amidst espionage accusations.
Leung's situation illustrates both the perils that informants face and the lengths to which nations will go in negotiating the release of detained citizens.
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