REPUBLIKA.CO.ID, WASHINGTON -- U.S. Defense Secretary Jim Mattis on Sunday threatened a "massive military response" to any attack on the United States or its allies after North Korea conducted its most powerful nuclear test to date.

Speaking outside the White House, Mattis said: "Any threat to the United States or its territories, including Guam or our allies will be met with a massive military response, a response both effective and overwhelming."

Mattis said Washington was not looking for the "total annihilation of a country, namely North Korea. But as I said, we have many options to do so."

On Sunday, North Korea detonated its sixth and most powerful nuclear test device, leading to a shallow magnitude 6.3 earthquake, which shook the country.

The earthquake occurred a few hours after North Korea announced it had developed an advanced hydrogen bomb. 

"The H-bomb, the explosive power of which is adjustable from tens kiloton to hundreds kiloton, is a multi-functional thermonuclear nuke with great destructive power which can be detonated even at high altitudes for super-powerful EMP (electromagnetic pulse) attack according to strategic goals," KCNA said.

"All components of the H-bomb were homemade and all the processes ... were put on the Juche basis, thus enabling the country to produce powerful nuclear weapons as many as it wants," KCNA quoted Kim as saying.

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