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 4 hours and no leaving the transfer/transit area is required).