The clutch of nuclear-armed states, including the United States, Britain, France, China, and Russia, have not signed the treaty.
Russian Foreign Ministry says US strategy gives "green light to the prospect of basing missile strike capabilities in space," which is confrontational.
International Campaign to Abolish Nuclear Weapons says it's ready to fund the summit between North Korea's Kim Jong-un and US President Donald Trump in Singapore, after reports suggested the North may have trouble bearing the cost of Kim's stay.
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.
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