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You're listening to the documentary from the BBC World Service.
This is the fifth floor at the heart of global storytelling with BBC journalists from all around the world.
I'm your host, Irana Taranyuk.
In April 2022, two months after Russia invaded Ukraine, A man in his thirties,
called Victor Mula Ferreira, flew in to Amsterdam Airport using a Brazilian passport.
He was identified by the Dutch authorities as Russian national Sergei Vladimir Vicherkasov and immediately sent back to Brazil,
where investigations by both the FBI and the Brazilian police identified him as a Russian intelligence officer.
He is currently serving a five-year prison sentence in Brazil for identity fraud.
With me on the line from Brasilia is Leandro Praceres,
who has been covering the story for BBC News Brazil and from London Olga Ivshina of BBC Russian.