 According to Air Navigation (Air Defence) Regulation 1 (2007), airspace over the territory and territorial waters of Sri Lanka (except Ruhuna Open Skies Area) are declared an air defence identification zone (ADIZ) with prohibited areas and restricted areas within it.No aircraft may operate in prohibited or restricted areas without valid air defence clearance (ADC) from the Sri Lanka Air Force (SLAF).Since October 25, 2015, all traffic is prohibited for Russian aircraft.