Turkish President Recep Tayyip Erdogan has rejected the Pentagon's ultimatum on Ankara's purchase of the S-400, ONA reports quoting sputniknews.
"The S-400s we're buying are not connected to the security of NATO, the United States or the F-35 in any way," Erdogan said, speaking at a rally in Diyarbakir on Saturday, according to Turkish television channel TRT.
"The reasons for our purchase of these systems are obvious," the president added, stressing that Ankara had nothing to hide regarding the intended use of the S-400s.
Erdogan expressed hope that the problems in relations between Turkey and the US over Ankara's purchase of the Russian air defence system could "be resolved in the same way as it has on other issues."