North Korea

To President Trump, all diplomacy is personal, especially with the two Asian strongmen he has courted most avidly, Kim Jong-un of North Korea and Xi Jinping of China. But Mr. Trump’s honeymoon with Mr. Kim came to an abrupt end in Vietnam last month, and his conviction that agreements between nations are little different than real estate deals between bosses now faces another stiff test with the Chinese president.

President Trump said Sunday that the congressional testimony of Michael Cohen, his former personal lawyer and fixer, was in part responsible for the collapse in negotiations with North Korea over its nuclear program last week — continuing to vent about the investigations encircling him and his associates.