Trump's stern words to the camera at his golf course in Bedminster, New Jersey, came hours after reports indicating North Korea can now wed nuclear warheads with its missiles , including those that may be able to hit the American mainland. The isolated and impoverished dictatorship has strived for decades to have the ability to strike the U.S. and its Asian allies, and the pace of its breakthroughs is already having far-reaching consequences for stability in the Pacific and beyond.