"This latest action by North Korea is reckless and poses an unacceptable further threat to the worldwide community".
US President Donald Trump after attending service for Hurricane Harvey victims, at St. John's Church in Washington on Sunday. "Their words and actions continue to be very hostile and unsafe to the United States".
Juche is North Korea's homegrown ideology of self-reliance that is a mix of Marxism and extreme nationalism preached by state founder Kim Il Sung, the current leader's grandfather.
It also showed his handwritten order for the test to be carried out at noon on September 3.
And the North has thousands of conventional artillery pieces within range of the South Korean capital Seoul.
Before taking office, Trump declared North Korea would not be allowed to develop an ICBM capable of reaching the U.S. mainland under his presidency.
Trump's rhetoric has appeared to allude to possible military action, but his former chief adviser Steve Bannon told The American Prospect: "There's no military solution, forget it". As with the five earlier nuclear tests, there is fear of radiation leaks.
South Korea, China and Russian Federation all voiced strong criticism of the move.
North Korea's sixth nuclear test - probably its largest so far - sends out one clear political signal.
On Twitter, Trump said Sunday that he was considering stopping all trade with countries that conduct business with North Korea.
It is the second time this year North Korea has spectacularly disrupted Beijing's attempt to highlight its place on the world stage.
The Prime Minister lashed out at Kim Jong-un after the rogue state detonated its first ever hydrogen bomb - five times more than powerful than the weapon dropped on Hiroshima by the USA to end World War 2.
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He added that she seemed to "have no plan at all" to deal with the issue of pollution from diesel emissions that exceeds the limits of several cities.
The test represents a significant escalation in the conflict between North Korea and the USA, and another act of defiance in response to President Trump's bluster toward the regime.
South Korea said it was seeking "the toughest retaliation measures" after the North tested another nuclear weapon, a national security official said. So far all efforts to pressure North Korea - sanctions, isolation and military threats - have all failed to move Pyongyang.
South Korea's new president, Moon Jae-in, has argued for continuing dialogue with its neighbor over its nuclear program, while also supporting global sanctions.
Trump's administration is now pursuing what it calls a strategy of "peaceful pressure" to get North Korea to bring its nuclear weapons program to the negotiating table.
The United Nations Security Council unanimously imposed new sanctions on North Korea in early July over its two intercontinental ballistic missile tests.
"There is no strike option that is not a war".
Earlier, China urged North Korea to stop "wrong" actions and said it would fully enforce United Nations resolutions on the country.
China's spokeswoman snapped that some parties appeared disinterested in peace talks and dialogue, only threats.
China's foreign ministry went so far as to blame the US and South Korea for conducting a large, week-long military drill that has historically provoked Kim.
The force of the explosion, at 100-150 kilotons, could have been ten times bigger than North Korea's previous test.
If the ball is in China's court on cutting oil, it may demand more willingness from the U.S. to come to the negotiating table with North Korea.
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