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The Russian, identified as Sergey Vladimirovich Cherkasov, 36, flew to the Netherlands in April using an elaborate deep cover story that he had built up over the past 12 years.
But Dutch authorities said they saw through his fake identity as 33-year-old Brazilian citizen named Viktor Muller Ferreira, and unmasked him as an agent of Moscow's GRU military intelligence.
Cherkasov was put on the next flight back to Brazil, where police said he was arrested for identity fraud.