The United States earlier threatened to remove Turkey from it's F-35 program after Ankara refused to scrap a deal with Russia to buy Moscow's cutting-edge S-400 missile systems, which Washington claimed could compromise US-made aircraft. This reported by Sputnik.

Ankara will consider purchasing Russian fighter jets as well if Washington refuses to deliver the F-35 aircraft to Turkey according to Turkish officials, cited by Bloomberg.

Turkish President Recep Tayyip Erdogan said Saturday that he discussed with US President Donald Trump the latter's possible visit to Turkey, as well as Ankara's intention to purchase Moscow's S-400 air defense systems alongside the purchase of US F-35 stealth fighter jets.

"We talked about our relations with the United States, we talked about the S-400s, we talked about F-35s and about what we could further achieve together. And we talked about a possible visit of Trump to Turkey", Erdogan said, on the sidelines of the G20 summit in Japan.

Erdogan also stressed that he believed the dispute with the US over the S-400s would be overcome "without a problem" and added that Trump supports Turkey in the row, according to Reuters.