Japan on Wednesday marked 15 years since a devastating earthquake and tsunami struck the country’s northeastern areas, triggering the world’s worst nuclear disaster since the 1986 Chernobyl crisis. The triple disasters of the magnitude-9.0 earthquake, resulting tsunami and meltdown of the Fukushima Daiichi nuclear complex led to the loss of more than 22,000 lives. The plant’s operator is still struggling to dismantle the damaged facilities by 2051. The central government stopped hosting memorial...