North Korea does not have the technology to mount nuclear warheads on its ballistic missiles.
“Pyongyang has made considerable progress in miniaturizing nuclear warheads but it still needs to develop a technology to mount them on missiles,” South Korean Defense Ministry sources were quoted as saying by Xinhua news agency.
The comment came two days after North Korea unveiled a new and bigger intercontinental ballistic missile, KN-08 at a military parade commemorating 70th anniversary of the ruling Workers Party last Saturday.
Lee Il-Woo, a defence analyst at Korea Defence Network, said the new version of the KN-08 has an estimated range of up to 12,000 kilometres (7,500 miles) and had a more rounded end than the version unveiled in 2012.
"This means North Korea might have successfully developed technology to minimise nuclear warheads and fit them on top of missiles," he told AFP.