A Stanford University professor warned on Tuesday that Pyongyang has demonstrated its ability to produce hydrogen-3, a radioactive isotope of hydrogen also known as tritium that’s “necessary for a hydrogen bomb to create fusion,” Sputnik news agency reported.
“The evidence is quite clear,” professor Siegfried Hecker told Yonhap News Agency on June 27, “that North Korea is able to produce tritium,” based on their experience making lithium-6, a central component for creating hydrogen-3. 
Since the North Korean military can create tritium, they have the “basic element” needed for thermonuclear weapons like the H-Bomb, Hecker said.
However, “it takes much more than that to weaponize hydrogen bombs,” the nuclear scientist said. North Korean leader Kim Jong-un has long made clear, however, his intention to develop a nuclear weapon regardless of pressures or sanctions from the international community. 

Source: MENA