West says Russia was poised to attack its neighbour, which is surrounded on three sides by about 150,000 Russian soldiers.
The five key nuclear-armed nations on Monday said that a nuclear war cannot be won and must never be fought
Kim Jong Un vowed all-out efforts to bolster his country's nuclear deterrent during a major ruling party meeting where he earlier laid out plans to work toward salvaging the broken economy
The August 9, 1945, bombing came three days after the United States dropped its first atomic bomb on Hiroshima, the world's first ever nuclear attack that killed 140,000
It said that it is committed to the goal of a nuclear weapons free world