It is seeking to develop a nuclear weapon small enough to be mounted on an ICBM.
North Korean state media released photos Sunday of the new nuclear warhead the country intends to load into its new intercontinental ballistic missile.
Rice said that ever since the George W. Bush administration had tried to negotiate denuclearization with the regime’s former leader Kim Jong Il, the country has continued its research and development of long-range missiles and bombs.
North Korea “recently succeeded” in making a more advanced hydrogen bomb, the country’s official KCNA news agency said.
If true, the development will increase tensions in the region already near the breaking point as Washington has postured toward military intervention with the isolated nation, against the advice of China and Russian Federation, and many other nations in the region.
The H-bomb can be detonated even at high altitudes for extremely powerful EMP attacks, it added. Juche is its state ideology meaning self-reliance.
The state-run media outlet claimed that all components were produced domestically, asserting that the North can produce as many thermonuclear weapons as it wants because it is not dependent on foreign imports.
Reports have suggested that Pyongyang could soon carry out a sixth nuclear test, but the respected 38 North website said last week that satellite imagery of the Punggye-ri test site showed no evidence that a blast was imminent.
North Korea previous year conducted its fourth and fifth nuclear tests, saying the fourth in January 2016 was a successful hydrogen bomb test, although outside experts say the claim has not been proven. Outside experts said that it appeared to be a test of a boosted fission weapon, rather than an H-bomb.
This week, North Korea launched an intermediate-range missile, identified by the North Koreans as the Hwasong-12.
The KCNA report made no mention of plans for a sixth nuclear test.
In July, North Korea tested two ICBMs, which analysts say could put much of the US mainland within range, including Los Angeles and Chicago.
Its fifth nuclear test in September 2016 was measured to be possibly North Korea’s biggest detonation ever, but the quake it caused was still not believed to be big enough to demonstrate a thermonuclear test.