North Korea has also tested the Hwasong-14 ballistic missile.

A more recent ballistic missile test is believed to have failed, and did not make it over to Japan.

"North Korea has been testing missiles with longer and longer ranges," said Joseph Byrne, a researcher at the Royal United Services Institute.

"This [activity] could be a sign that they will test another nuclear warhead, which has been predicted for some time," he added.

North Korea has also tested the Hwasong-14 ballistic missile. This missile has a range of 8,000 km - although some studies suggest it can travel as far as 10,000 km, thus being able to reach New York. This is North Korea's first intercontinental ballistic missile (ICBM).

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