Ukraine has succeeded in every combat domain except for ballistic missiles, which remain a critical gap in Kyiv’s arsenal against Russia, the Ukrainian envoy to the U.S. said Thursday. The ambassador, Olga Stefanishyna, noted that President Trump gave Ukraine the green light to manufacture its own interceptors for the Patriot missile system. That timeline could range from 12 months to five years before a domestic Patriot missile could be deployed, and she said that means trouble. “This winter we need missiles,” Ms. Stefanishyna said. “So many people will die over the winter” without them.