The gunman accused of killing Japan’s former prime minister Shinzo Abe pleaded guilty on Tuesday, three years after the assassination in broad daylight shocked the world. The slaying forced a reckoning in a country with little experience of gun violence, and ignited scrutiny of alleged ties between prominent conservative lawmakers and a secretive sect, the Unification Church. “Everything is true,” Tetsuya Yamagami said at a court in the western city of Nara, admitting to the murder of the...