Pyongyang's quest for nuclear weapons has its roots in the post-WWII history of the Korean Peninsula, and especially a war that has never ended.
North Korea says it carried out a test of what it described as a hydrogen bomb designed for a long-range missile.
Tremors felt by a nuclear test carried out by Pyongyang are estimated to be ten times more powerful than their last, Japan and South Korea claim.
US and Japanese fears about North Korea's missile and nuclear bomb programs have grown in recent weeks and prompting the two countries to cooperate more.
The latest launch comes less than a month after the North conducted its first ICBM test in defiance of years of efforts led by the United States, South Korea and Japan to rein in Pyongyang's nuclear weapons ambitions.
North Korea says it will continue to test nuclear weapons, stating it will bolster its nuclear force in the face of what it calls US aggression and hysteria.
The measure is expected to go to the full UN General Assembly for a vote in late November or early December.
Japan says tests proof of intensifying threats; South Korea's Foreign Ministry warns North Korea may face even stronger sanctions.
North Korean leader Kim Jong Un says his country will not use nuclear weapons unless it is threatened.
US report claims North Korea may have resumed tunneling at nuclear test site
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