There is no redundancy when it comes to keeping aware of significant happenings that can trigger a war.  In this light, what would be the "trigger" factor?  Would this lead to a nuclear exchange?  What would be the result after an exchange does occur?  Where would the nation stand, and how, after an EMP (Electromagnetic Pulse) attack, and/or a limited nuclear war?  All of these are difficult questions to answer.  Cato the Elder ended his speeches on the floor of the Roman Senate with "CARTHAGO DELENDA EST," translating into "Carthage must be destroyed."  To utilize his "technique" of impressing such upon his audience, here is my personal caveat that I repeat wholeheartedly:

A war would be kicked off with an EMP weapon detonated over the Continental United States, then a nuclear exchange, resulting in a World War.

That being mentioned, the North Koreans detonated another nuclear device, of greater size than previous tests.  This particular test was their fifth, and they conducted it on Friday, September 9th right after Obama left China from the G-20 summit held there.  A Pyongyang newscaster was quick to trumpet the success of the test, as such:

"We successfully conducted a nuclear explosion test to determine the power of [the] nuclear warhead.  We will continue to strengthen our nuclear capabilities to protect our sovereignty. We have now standardized and minimized nuclear warheads … We can now produce small nuclear warheads any time we desire."

North Korean State Television

The USGS (United States Geological Survey) reported that the aftershock from the explosion left a 5.3 magnitude seismic tremor.  Estimates of the size of the nuclear device range from 20 to 30 kilotons.  The atomic bombs dropped on Hiroshima and Nagasaki were 15 and 21 kilotons, respectively; therefore, this latest North Korean test falls well within the range of being able to take out a city.  The estimate came from Jeffrey Lewis, the Director of the East Asia Nonproliferation Program in an interview with the Washington Post.

The biggest threat doesn't simply come with North Korea, however: the larger threat is the climate of disbelief fostered by naysayers that denigrates North Korea's capabilities and efforts, leading to a relaxed, complacent posture.  As much as the North Koreans have been testing SLBM's (Submarine-Launched Ballistic Missiles), medium-range missiles, satellite launches, and nuclear tests, there is plenty of evidence to support their claims of nuclear warhead miniaturization capabilities.  One good example of such a naysayer to miniaturization that shows the folly of such though is the statement by Melissa Hanham of the Middlebury Institute of International Studies based in California, as follows:

"We would need to see it tested on a missile, like China did in the 1960s.  Nobody wants to see that. There is no way they could do that test in a safe way, and it could easily start a war."

She is listed as an "expert on North Korea."  Thanks for nothing.  Basically, she stated that they'll be able to verify it [the miniaturization, and the effectiveness] after it has been put to use…in a war.  Brilliant.