North Korea has mastered the technology to miniaturize nuclear warheads and mount them on a wide range of ballistic missiles, a South Korean military expert and a think tank run by Seoul’s National Intelligence Service (NIS) said recently.

Speaking at a seminar entitled “evaluation of North Korean nuclear weapons and weapon of mass destruction (WMD) in 2016” held in Seoul on Tuesday, a South Korean expert said North Korea is able to manufacture a miniaturized nuclear warhead measuring 70cm in diameter using 10-15 kilograms of highly enriched uranium (HEU).

The minituarized warhead shown on North state-run media in March was very likely genuine,