Taiwan this week became the second World Trade Organization member to formally ask to join China’s dispute proceedings against U.S. export controls aimed at restricting Beijing’s access to advanced chips. Russia asked to join the consultations, the first step in a WTO dispute, late last month; China announced its plan to initiate the dispute on Dec. 12. Taiwan’s request is notably the first from a U.S. ally. The island is a major chip manufacturer and is involved with the U.S.-led...