President-elect Donald Trump long ago earned a reputation for being unpredictable in his statements, but he outdid himself on Thursday. In the span of just a few hours, Trump shook international relations by undercutting the Obama administration over a UN resolution on Israeli settlements, indicated he would ramp up nuclear competition with Russia and then jolted a major defense contractor — and its shareholders — by suggesting he would ask Boeing to replace a fighter jet being made by Lockheed Martin.