North Korea has conducted a nuclear test on Sunday!

https://sg.news.yahoo.com/north-korea-explosion-points-nuclear-test-043842707.html?hl=1&noRedirect=1

This nuclear test is a retaliation against the latest USA sanction.  NK had previously stated clearly that it would retaliate and it did with a nuclear test.

A nuclear test is a breach of the red line drafted by the USA especially Trump.  This nuclear test is to challenge Trump on his previous conviction to attack NK if a nuclear test was conducted.

If Trump doesn't keep to his word to attack NK for the nuclear test, then the USA will lose its credibility and it will be difficult to trust the USA on its future endeavours.

China and Russia had stated that the new sanctions would escalate the tension.  Indeed, it really happened with a nuclear test.

http://sg-stock.blogspot.sg/2017/09/china-and-russia-have-stated-that-new.html

North Korea won't give up its nuclear program because it doesn't trust the USA due to USA bad records of reneging on its promises.  NK has learnt a great deal from the historical events in the middle east.  The USA would only attack countries who gave up on nuclear programs or without nuclear weapons.

Let's see how Trump will respond to this latest nuclear test.