U.S. President Donald Trump’s pledge to give Ukraine a license to produce Patriot air-defense systems could mark a major breakthrough for Kyiv. But experts and Ukrainian officials warn that turning the idea into real weapons would likely take years. Speaking Wednesday alongside Ukrainian President Volodymyr Zelenskyy at a NATO summit in Ankara, Turkey, Trump said the United States would allow Ukraine to make the U.S.-designed systems that Kyiv has long sought to shield its cities from Russian missiles and drones. A production license would not automatically allow Ukraine to manufacture complete Patriot batteries. It could instead cover a narrower part of the system, such as interceptor missiles or selected components.