Denmark’s prime minister insisted that her country can’t negotiate on its sovereignty on Thursday after U.S. President Donald Trump said he agreed a “framework of a future deal” on Arctic security with the head of NATO, and said she has been “informed that this has not been the case.”Trump on Wednesday abruptly scrapped the tariffs he had threatened to impose on eight European nations to press for U.S. control over Greenland, a semiautonomous territory of NATO ally Denmark. It was a dramatic reversal shortly after he insisted he wanted to get the island “including right, title and ownership.”He said “additional...