Japanese Prime Minister Sanae Takaichi is pushing for the first-ever revision of the country’s post-World War II pacifist constitution. This move is expected to be welcomed by Washington but strongly opposed by Beijing.

Japanese Prime Minister Sanae Takaichi is pursuing the first ever revision of her country’s post-World War II pacifist constitution, a step that observers say is likely to be welcomed in Washington and condemned in Beijing. Takaichi’s Liberal Democratic Party (LDP) secured a historic two-thirds majority in the National Diet’s lower house in February’s election, passing the threshold needed to pass constitutional amendments without other parties’ support. “An independent constitutional amendment....