REPUBLIKA.CO.ID, TOKYO -- Greater pressure is needed on North Korea, including stronger United Nations resolutions, Japanese Prime Minister Shinzo Abe and South Korean President Moon Jae In agreed during telephone talks on Monday, Jiji Press said.

Abe and Moon spoke after North Korea conducted its sixth nuclear test on Sunday.

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.

Also read: Japan says to impose additional sanctions against North Korea

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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