The Hunt For A Russian Spy: How The FSB Used A Mexican Man To Target A Defector In Miami
A Russian-trained Mexican microbiologist will soon be released from a U.S. prison, a year after pleading guilty for his role in a bungled job surveilling a government informant. Turns out the informant was a Russian defector whose betrayal of a spy network in the U.S. infuriated Vladimir Putin.  
Source: rferl.org