Chronology of North Korean missile developmentSeoul (AFP) - North Korea appeared to carry out a sixth nuclear test Sunday, with seismic monitors measuring an "explosion" of 6.3 magnitude near its main test site.
Japan's government said it confirmed a nuclear test had been carried out.
Hours earlier, Pyongyang's state media claimed that the country had developed a thermonuclear warhead that could be fitted onto its new intercontinental ballistic missile, another brazen assertion of its weapons capabilities.
The official Korean Central News Agency said leader Kim Jong-Un had inspected a miniaturised H-bomb that could be loaded onto a missile -- although doubts remain over the veracity of Pyongyang's claims.
Here are key dates in the North's quest to develop a nuclear-tipped missile capable of hitting the United States:
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