No turning back from Russia S-400 deal: Çavuşoğlu
"The S-400 deal is a done deal and we will not step back from this," he told a think-tank forum in Washington, where he is taking part in 70th anniversary celebrations of NATO.
Çavuşoğlu said Turkey turned to Russia as it could not buy U.S. Patriot missiles and quoted President Donald Trump as saying in an unspecified phone call that his predecessor Barack Obama had made a "mistake" not to sell the system to Ankara.
The Turkish foreign minister said the S-400 deal did not signal a warning toward Russia.
"We have been working with Russia," he said.
"But it doesn't mean that we are undermining the alliance and we agree with Russia on everything. There is no shift on our foreign policy."
U.S. policymakers worry that Russia will obtain data from the F-35s to hone the ability of the S-400 to shoot down Western planes.
He also said Turkey has proposed to the United States that they form a technical working group to determine that Russian S-400 missile defense systems do not pose a threat to U.S. or NATO military equipment.
The U.S. administration and Turkey should explain to the U.S. Congress why Ankara had to purchase the S-400 missile system, he also told.