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In this photo provided by South Korea Defense Acquisition Program Administration, a U.S. F-35A fighter jet lands at Cheongju Air Base in Cheongju, South Korea, Friday, March 29, 2019. South Korea on Friday received the first two of the 40 F-35A fighter jets that it has agreed to buy from Lockheed Martin by 2021. The F-35A jets that arrived at an airport in southern South Korea have become the country's first stealth fighter jets. North Korea has previously called the introduction of F-35A aircraft a plot by Seoul to attack North Korea. (South Korea Defense Acquisition Program Administration via AP)