Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Turkey Challenges US as Russian Missiles Arrive Dorian Jones ISTANBUL - Updated: July 12, 2019, 1:37 p.m. Russia is delivering its S-400 missile system to Turkey, a move that threatens to rupture Turkish-U.S. relations and puts Russian military technology inside a key NATO alliance member. A Russian transport jet Friday brought the first delivery of the $2.2 billion missile system to a Turkish military air base outside Ankara, causing concern from Brussels to Washington. Washington says the S-400, with its advanced radar that could potentially be used to target NATO jets, threatens to compromise NATO military systems in Turkey. The United States has ruled out delivery of its latest F-35 jet if the Russia missiles are deployed, and Turkish firms face being frozen out of the consortium that is building the F-35. Video shared by Turkish Ministry of Defense, Friday, July 12, showed parts of S-400 missile defense system being unloaded from Russian cargo planes.[1]https://t.co/2ZirwOYUrV [2]pic.twitter.com/pzxNyj4AJF -- The Voice of America (@VOANews) [3]July 12, 2019 "We are aware of Turkey taking delivery of the S-400. Our position regarding the F-35 has not changed, and I will speak with my Turkish counterpart Minister Akar this afternoon," Acting U.S. Secretary of Defense Mark Esper told reporters Friday. U.S. State Department spokesperson Morgan Ortagus warned Tuesday of "real and negative consequences" if the Russian missiles are procured. Possible sanctions Potentially more damaging for Turkey are U.S. sanctions under the Countering America's Adversaries through Sanctions Act (CAATSA), which could hit Turkey's already weakened economy. Ankara is relying on Turkish President Recep Tayyip Erdogan's relationship with U.S. President Donald Trump. Last month, the two presidents met in Japan on the sidelines of the G-20 summit of the world's largest economies. At the time, Trump acknowledged the U.S. had a "complicated" situation, when it came to responding to Turkey, and noted that possible sanctions were being discussed. International relations expert Soli Ozel of Istanbul's Kadir Has University points out that, with both Democrats and Republicans united in Congress on taking a tough stance against Turkey on the S-400, he thinks Ankara is miscalculating. "If Congress says CAATSA takes effect, can Trump really say, 'I will not be implementing it?' He can, but can he get away with it? I don't think so. But that is what Ankara believes, and is the thread they are hanging onto. I don't know where analysis ends and wishful thinking begins with this administration," Ozel said. References 1. https://t.co/2ZirwOYUrV 2. https://t.co/pzxNyj4AJF 3. https://twitter.com/VOANews/status/1149698288289009665?ref_src=twsrc%5Etfw .