Last year I strongly believed that Trump would not launch a pre-emptive strike on North Korea. That view has now changed to more chance than not that by the end of the year he will, particularly given the changes in his administration.
The article from Newsweek is surprisingly spare. Though I suppose that it because it's based on what Castro has said.
The results of a pre-emptive strike on North Korea would not only be devastating for the people of North Korea & Seoul but other major cities throughout South Korea and Japan. Make no mistake the two countries that North Koreans have had drummed into them are the ultimate enemies are the U.S. and Japan. Not helping is that China has cordial but hardly close relations with Japan. The grudges from WW2 still run deep amongst the ruling class of China.
The very thought of nuclear warheads, even smaller ones, dropped on Seoul, Pyongyang, Busan, Tokyo, Kyoto is simply beyond comprehension. It will be a humanitarian crisis that the world has not seen since WW2. It's also no wonder China tries to keep on the good side of North Korea because Shanghai & Beijing are both within easy striking distance. Nothing worse than a cornered nation has nothing to loose because they will even potentially lash out at their only alley (China).
To make matters worse there is nothing any of them can do. Japan has a missile defence system but to date have not used it when North Korea flies missiles over their territory. Two reasons for this. One because they don't want to escalate the situation with North Korea. The second is way more disturbing. The is only something like a 1 in 4 or 1 in 5 chances that the missile defence system would even work and that primary reason Japan hasn't used it is because the domestic issues that will cause the Japanese Government with the general population.
Also, a conflict in this area of the world, even a relative 'minor' one opens up the doors for other countries to enact illegal and immoral actions themselves whilst the worlds attention is focused on a ramifications of a limited nuclear exchange.
Russia is eager to have the Baltic states back in it's control, as is China with Taiwan. This would also give China an opportunity to become more hardline with Hong Kong.
There is also the economic fallout from this which will be global and could be the tipping point to another GFC, which is inevitable anyway.
Not to mention the highly possible isolation of the U.S. from the rest of the human race. Trump has recently started a trade war which is an incredibly stupid thing to do. The rest of the world can adjust itself over time and deal between themselves. Isolationism doesn't work in the 21th Century. Just ask North Korea who would be fucked if it wasn't for China.
I think the only thing that may stop Trump and his friends for this week is the fact that so many Americans, both military and civilians are in South Korea (and Japan) at any given time. It is virtually impossible to evacuate them without the South Korean's knowledge and I think this is probably the only dilemma that Trump faces.
"I have no interest in all of that. I find that all tabloid stupidity" Woody Allen, The Guardian, 2014, in response to his adopted daughter's allegations.