Domestic flightsAll the passengers should go through passport control and security check on the second floor after check-in. Passengers with family pets should also undergo veterenary check before come to the sterile area.
International flightsAll the passengers should go through custom check, followed by check-in, and then border check and security check. Passengers with family pets should also undergo veterenary check before entering the customs area.
When transit/transfer passengers transfer from international to international flights, no Russian transit visa is required (if the time to the connecting flight does not exceed 24 hours and no leaving the transfer/transit area is required).