Blue Stream
Gas from Russia comes via the Blue Stream and TurkStream pipelines. Iran, the second biggest supplier, is connected via the Tabriz–Ankara pipeline. Azerbaijan normally supplies Turkey through the South Caucasus Pipeline. Its gas flows onward through the Trans-Anatolian gas pipeline supplying Turkey and some continues across the Greek border into the Trans Adriatic Pipeline. But , Turkey was not being supplied, as the long-term contract had expired and new terms had not yet been agreed.