China’s Year of the Ox, which began on Friday, is a fitting metaphor for the most formidable, and potentially dangerous, geopolitical challenge facing Joe Biden and the western democracies. In Chinese mythology, the ox is large, powerful and adept on land and water. It’s determined, stubborn, and takes a lot of stopping. Biden is well aware he has a fight on his hands that, if mishandled, could swiftly turn physical. Some analysts fear war with China is inevitable, sooner or later. So he is moving fast. In a first phone call to China’s president, Xi Jinping, last week, he raised...