NATO’s official position on Turkey’s S400 is one of respect for its sovereign defence choices, but NATO members have expressed different reservations that sometimes overlook similar Russian defence purchases of their own.
Pentagon says that it is "deeply concerned" with reports that Turkey is bringing it into operation the S-400 missile defence system that it had purchased from Russia.
Turkey had procured the S-400 missile defence systems from Russia after talks with the US on its American Patriot defence systems had broken down.
US Air Force to officially purchase F-35A fifth-generation stealth fighter jets originally built by Lockheed Martin for Turkey as part of $862 million contract modification.
Lieutenant Colonel Mike Andrews, a US Defense Department spokesman, said a decision had been made in late 2019 "to honour existing contractual arrangements and accept delivery of parts that were already on contract."
President Trump, who made the remarks during an interview with Fox Business Network’s Maria Bartiromo, said the US makes parts for F-35 jet all over the world and cited challenges of global cooperation.
Turkey and Russia pledge to continue cooperation in the military and energy spheres as well as in Syria.
Foreign Minister Mevlut Cavusoglu warned if the US imposes sanctions, Incirlik Air Base and Kurecik Radar Station, where US soldiers are stationed, in Turkey would come into question.
Foreign Minister Mevlut Cavusoglu said more missile systems are essential for Turkey's security and despite the purchase of Russian S-400s, Ankara is open to buying US-made Patriots.
Turkish Defence Minister Hulusi Akar said Turkey would have to look for alternatives if it could not acquire US F-35 jets over the purchase of the advanced Russian S-400 air-defence system.
The Russian-made defence hardware will be activated after relevant military personnel are trained, says Turkish defence minister.
Ankara is not only an F-35 fighter jet customer but also a partner, Turkish President Erdogan underlined at a Justice and Development Party's parliamentary meeting.
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