When flying from Moscow to Brazil (e.g., via Addis Ababa), travelers often report no specific document checks beyond a passport in Moscow or during transit.
Upon arrival in Brazil, tourists are typically only asked about the purpose of their visit (tourism). A hack mentioned is to purchase a refundable onward ticket to a neighboring country from Moscow, present it if required, and then cancel it. Hotel bookings and yellow fever vaccination certificates have reportedly not been requested upon entry to Brazil or return to Russia for some travelers.
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