President Recep Tayyip Erdogan broke his silence over a USA threat to punish Turkey with sanctions should it buy an advanced Russian S-400 missile-defence system, saying the purchase is a "done deal".
Akar also stressed that Turkey purchasing S-400 missile defense systems from Russian Federation is "not a choice but a necessity".
Earlier this week, the head of U.S. European Command told lawmakers the United States should not move forward with the F-35 sales, should Turkey purchase the S-400.
Despite many attempts to purchase the Patriot air defense system from the U.S., Turkey has not been able to achieve this due to conflicts such as the "transfer of technology" issue.
American officials have been working feverishly behind the scenes to reduce tensions and maintain strong relations between Washington and Ankara.
Erdogan said Turkey could still purchase the Patriot system "if the conditions are suitable, the prices are suitable (and) if we can conduct a joint production". "We may also go into S-500s after the S-400s".
Russian Federation media reported that Turkey meant to buy four S-400 units for a price of $2.5 billion.
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Mr Erdogan would do well to heed the warning, as well as the possibility of U.S. sanctions.
Some have said the USA is concerned that the S-400 poses security risks to the F-35 Joint Strike Fighter project.
Turkey plans to buy 100 joint strike fighters over the course of the program, and its first F-35 pilots have already begun training alongside US pilots at Luke Air Force Base, Arizona. "In total, F-35 industrial opportunities for Turkish companies are expected to reach $12 billion", according to information posted by Lockheed Martin, the jet's manufacturer.
"My best military advice would be that we don't then follow through with the F-35, flying it or working with allies that are working with Russian systems, particularly air defense systems", Army Gen. Curtis Scaparrotti said Tuesday.
Ankara is slated to receive the S-400 later this year in hopes of making the system ready for use by 2020.
The countries have since become increasingly cooperative over Syria, where both are entangled in ongoing military operations and political negotiations to end the war.