Japanese Prime Minister Sanae Takaichi’s sweeping victory in Sunday’s snap election has sounded alarm bells in Beijing, which is wary that closer ties between Tokyo and Taipei could complicate its long-term objective of reunifying Taiwan. Beijing’s annual work conference on Taiwan affairs, held on Monday and Tuesday, came just after Japan’s lower-house election, in which Takaichi’s party secured a two-thirds supermajority. At the event, Wang Huning, the Communist Party’s fourth-ranked leader,...