The upcoming visit by President Joe Biden to Hiroshima should help promote global momentum toward nuclear disarmament and nonproliferation, a former U.S. ambassador to Japan said.John Roos, who served as the country's top envoy to Tokyo under President Barack Obama, expressed hope that the two countries will lead efforts to seek a world without nuclear weapons, during a recent interview with Kyodo News ahead of the May 19-21 summit of the Group of Seven industrialized nations.As Obama's vice president, Biden "was very supportive of President Obama going to Hiroshima during his presidency, a…READ FULL ARTICLE