Como você está saindo do aeroporto e não fica apenas no trânsito aéreo, você precisará de um visto mesmo estando hospedado menos de 24h - a menos que seja de um dos países cujos cidadãos têm permissão para viajar sem visto, veja este artigo da wikipedia para obter uma lista de países.
Se você estiver hospedado em trânsito internacional e permanecer por menos de 24h, não precisará de visto de acordo com isto :
Direct airside transit
Passengers travelling through international airports do not need a visa for a transit of less than 24 hours, provided a confirmed onward ticket is held and the traveller remains in the international transit area (without clearing passport control).
Only five Russian airports have an international transit area:
- Moscow's Sheremetyevo International Airport (SVO) - terminals D, E and F
- Moscow's Domodedovo International Airport (DME)
- Moscow's Vnukovo International Airport (VKO) - terminal A
- Saint Petersburg's Pulkovo Airport (LED) - new terminal 1
- Yekaterinburg's Koltsovo International Airport (SVX) - international terminal.
Além disso, o site da Novosibirsk Tolmachevo (OVB) afirma:
Transit of transfer passengers from an international flight to an international flight (IAL-IAL) occurs with the passage of all departure procedures for boarding a connecting IAL flight at the airport of IAL (Terminal B).
No Russian visa is required for a transit of transfer passengers from an IAL to an IAL of the connecting time of a flight is less than 4 hours and a passenger does not leave the airport. Arriving passengers are accommodated in the transfer hall in the sterile area on the second floor of the airport of an IAL (Terminal B).
For transit of transfer passengers from an IAL flight to an IAL flight, in case if the connecting time exceeds 4 hours, the arrived transfer passengers shall go into the arrival hall on the first floor of the airport of an IAL (Terminal B) for passage of border control, baggage handling and customs control thereafter.