A new study reveals that an additional 136 warheads were attributed to Russia, which has the world's largest arsenal with 5,889 operational warheads, as well as China, India, North Korea and Pakistan.
Kim Jong-un made the remarks as he inspected the country's nuclear weapons programme, including new tactical nuclear weapons and technology for mounting warheads on ballistic missiles, state media reported.
South Korea says the missiles flew cross-country after being fired from a western inland area south of the North Korean capital of Pyongyang.
Drone system is designed to unleash "radioactive tsunami" in enemy waters and destroy naval striker groups and major operational ports, state media say.
International community cannot turn blind eye to dire situation in North Korea simply because it does not have access, Special Rapporteur Elizabeth Salmon says.
Move to strengthen military cooperation follows a meeting in Tokyo earlier this week between South Korean President Yoon Suk Yeol and Japanese Prime Minister Fumio Kishida — the first such summit in 12 years.
About 800,000 students and workers across the country expressed desire to enlist or re-enlist in the military to counter US, local media report.
The leaders of Japan and South Korea promised to resume ties in a historic summit as the two neighbours seek to confront threats from North Korea and rising concerns about China.
The visit comes hours after North Korea fired a long-range ballistic missile.
Last week, North Korean leader Kim Jong Un ordered his troops to be ready to repel what he called the “frantic war preparations moves” by his country’s rivals.
The launch came hours before South Korea and the United States were set to kick off their largest joint exercises in five years amid nuclear-armed Pyongyang warning such drills could be seen as a "declaration of war".
Kim Jong-un orders military to intensify drills to deter and respond to "real war" if necessary, state media say, after leader oversees drill simulating attack on South Korean airfield.
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