Japanese Prime Minister Sanae Takaichi was heckled at a World War II memorial event by protesters angry about Tokyo’s further shift away from its decades-long pacifist stance, television footage showed. Close US ally Japan in April loosened rules on lethal arms exports and Takaichi, long seen as a security hawk who last year riled mainland China with comments about Taiwan, has said she wants to revise the constitution. A small but vocal number of demonstrators shouted slogans throughout...