The Japanese city of Nagasaki today commemorates the 65th anniversary of its atomic bombing. The United States for the first time sent an envoy to commemorate the Hiroshima bombing on Friday.The move reflects US President Barack Obama's push for a world without nuclear weapons. Britain, France and Israel have also sent their diplomats to participate in the Nagasaki ceremony for the first time.During the ceremony, Nagasaki mayor Tomihisa Taue is expected to express his support for US Secretary General Ban Ki-moon's initiative for an international convention to outlaw nuclear arms.Nagasaki was devastated by a plutonium bomb nicknamed Fat Man which claimed lives of more than 70,000 due to burns and radiation sickness.