North Korea's nuclear arsenal could reach four to eight bombs during the next year and increase by up to 13 additional bombs per year by the end of the decade, according to a London-based think-tank.
The time is running out on diplomatic efforts to halt the Pyongyang government's nuclear programme while it remains relatively small, the International Institute for Strategic Studies has said.
"What we're saying is in the near-term immediate future North Korea's ability to increase its nuclear arsenal is very limited," said Gary Samore, the report's principal author, who was senior director for non-proliferation and export controls at the National Security Council during the Clinton administration.
"But as you go beyond that window it really begins to get into the range of dozens of nuclear weapons," he said. The institute's 120-page report cautioned that it was impossible to know for certain how many nuclear bombs, if any, North Korea currently possessed.
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