Japanese Prime Minister Sanae Takaichi won a landslide election victory, and the nation’s first single-party supermajority since World War II, after a campaign centred on cutting taxes and boosting defence spending amid a dispute with China. Takaichi’s Liberal Democratic Party (LDP) was on track to win 316 seats in the 465-seat lower house of parliament, according to public broadcaster NHK, clearing the two-thirds threshold needed to override the upper chamber. The Japan Innovation Party, an LDP...