tipWhen flying from Moscow to Brazil via Addis Ababa (Ethiopian Airlines), typically only a passport is required for transit in Addis Ababa.
Upon arrival in Brazil (e.g., São Paulo), customs may ask for the purpose of the visit (e.g., 'Tourism'). At the initial departure point (e.g., Moscow), airlines may verify the presence of a return or onward ticket. If the flight to Rio is a domestic leg after initial entry in São Paulo, further checks at Rio airport are unlikely.
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