The development comes shortly after North Korea said it had conducted another 'crucial test' at its Sohae satellite launch site.
North Korea has said that its recent tests of defence technology are directed towards subduing nuclear threats from the United States, news agency Reuters reported citing North Korea's state news agency KCNA.
The state agency on Saturday had reported a senior North Korean military official saying that that "hostile forces" should not provoke North Korea.
Chief of the General Staff Pak Jong Chon warned that "hostile forces," including the United States, should refrain from provoking North Korea if they wanted to see a peaceful year-end, state news agency KCNA said as reported by Reuters.
"Another crucial test was successfully conducted at the Sohae Satellite Launching Ground from 22:41 to 22:48 on December 13," a spokesman for the North's National Academy of Defence Science said in a statement carried by the official KCNA news agency.
The "research successes" will be "applied to further bolstering up the reliable strategic nuclear deterrent" of North Korea, the Reuters report added quoting the spokesman.
The announcement comes after the United States tested a medium-range ballistic missile over the Pacific Ocean on Thursday.
North Korean leader Kim Jong Un has set a year-end deadline for talks with the United States, warning he may take an unspecified "new path" if concessions aren't made.