A beautiful jewelry designer who criss-crossed Europe for 10 years was actually a Russian spy who infiltrated NATO by charming and seducing commanders. She was known as Maria Adela Kuhfeldt Rivera but her real name was Olga Kolobova, and she was a spy working on behalf of Russia’s GRU foreign intelligence service, according to the investigative site Bellingcat, which used photo-matching software to out her. Rivera took up residence in Rome, Malta and Paris before making Naples, Italy, her home base. She owned a jewelry boutique and talked her way into the city’s international party scene, including soirees and balls...