US, Russia, UK, France, China, Pakistan, India, Israel and North Korea together possessed an estimated 13,400 nuclear weapons at 2020 begining, Swedish peace research institute says.
Russia warned of a potential arms race with the United States during a Security Council meeting about US plans to develop and deploy medium-range missiles.
Hiroshima is stepping up efforts to keep the memories of the calamity alive, as the survivors of the bombing, known as hibakusha, get older.
Japanese PM Shinzo Abe, whose government has chosen not to participate in the UN Treaty on the Prohibition of Nuclear Weapons ,said at the official ceremony his country's responsibility was to bridge the gap between nuclear and non-nuclear nations.
US President Donald Trump is threatening to tear up the 2015 agreement aimed at curbing Tehran's nuclear efforts. France's Emmanuel Macron will visit the US to persuade Trump from doing so.
The Nobel peace laureate group ICAN's warning comes amid increasing tension in the Korean Peninsula over Pyongyang's nuclear ambition.
The International Campaign to Abolish Nuclear Weapons (ICAN) which brings together more than 450 organizations, was a driving force behind an international treaty on banning nuclear weapons that passed this year.
Pope Francis renewed calls for global nuclear disarmament at a Vatican meeting, saying the world should condemn not only their possible use but "their very possession."
Nobel committee awarded prize to ICAN, a coalition of non-government groups, in bid to bolster case for nuclear disarmament.
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