Turkey on Friday vowed there would be no "step back" from Ankara's controversial purchase of the Russian S-400 missile defence system despite the threat of US sanctions.
"There is no question of a step backwards, Turkey will activate the S-400," promised President Recep Tayyip Erdogan's spokesman, Ibrahim Kalin, in an interview with state broadcaster TRT Haber.
Ankara's deal with Russia and the subsequent delivery of the system in July has been a major source of tension between NATO allies Turkey and the United States.
Last month the US said Turkey would be spared sanctions under a 2017 law if the S-400 system is not turned on.
The American act, known as CAATSA, mandates sanctions for any "significant" purchases of weapons from Russia.
Turkey was also removed from the F-35 fighter jet programme as a consequence of the purchase.
The issue was on the agenda during Erdogan's talks with US President Donald Trump on Wednesday.
Trump told reporters after their meeting that Turkey's ...
