Turkish foreign minister Mevlut Cavusoglu issued the ultimatum to President Trump in an attempt to force the American’s hand over the sale of the fighters, after Mr Trump backlisted Ankara from buying them. Mr Cavusoglu warned Turkey would not bow down to the US and would buy more Russian S-400s if Washington continues to halt the sale of the jets. He told Turkish broadcaster NTV: “If the United States is willing to sell, then we’ll buy Patriots. However, if the United States doesn’t want to sell, we may buy more S-400s or other systems.
“If the F-35s don’t work out, I will again have to procure the jets I need from elsewhere.”
Referring to the Russian-made jets, he added: “There are SU-34, SU-57 and others.”
Continuing his threat he added: “I will absolutely meet my needs from somewhere until I can produce it myself.”
The US has attempted to dangle the US Army Patriot systems in front of Turkey to try and distract them from the F-35 stealth fighter jets.
The highly advanced Russian-made S-400s are seen as a huge threat to the US as they have the potential to compromise their radar and electronic capabilities.
The US fears that in selling Turkey their F-35 jets it would essentially be exploiting any vulnerabilities Washington has to Moscow.
The news comes after Nato’s head issued a stark warning Russia poses “a more assertive threat” due to its ever-expanding military.
Secretary general Jens Stoltenberg was speaking to the US Congress when he issued the caution to American officials.
He said: “We must overcome our differences now because we will need our alliance even more in the future. “We face unprecedented challenges – challenges no one nation can face alone.”
Mr Stoltenberg called on Moscow to comply with the Intermediate-range Nuclear Forces Treaty, which US President Donald Trump plans to withdraw the US from.
He added: “NATO has no intention of deploying land-based nuclear missiles in Europe.
“But NATO will always take the necessary steps to provide credible and effective deterrence.”
He had been invited to speak as NATO commemorates its 70th anniversary in Washington last week.