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In this photo provided by South Korea Defense Acquisition Program Administration, two U.S. F-35A fighter jets, center and center left, fly with South Korean air force fighter jets over 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)