Tom Lehrer - A man who was way ahead of his time in many ways. I only wish he would (and could) write and perform some new tunes for today's absurd reality. But I can't stop thinking of his song written in advance for World War 3: "So long mom (A song for World War 3)."
North Korea is taking advantage of the weakness it sees in the West to become even more belligerent. Trump is the critical weak point in the West's resolve to keep the peace, a peace which allows South Korea to prosper. And I can only see war in the future, with the likely possibility that nuclear weapons will be used as they may be the only tools which will stop North Korea from becoming a threat to the entire Western world.
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The problem dates back to the 1950's, when China decided to fight with North Korea against America and its allies to keep the American forces from coming too close to their border. China got stuck with protecting the Kim family's dysfunctional regime. We were at the beginning of the Cold War with Communist states, and the fighting in Korea was an anomaly. The Kims saw that they could become miniature emperors as long as they tied their wagons to Communist horses.
After almost 70 years since the uneasy peace was declared, the Kim family is still in power. They have used an elegant form of ransom to extract money from the West - holding Seoul as an effective hostage. Since South Korea has become a wealthy nation, the West would lose even more wealth if war were to break out again. So it decided to pay the ransom and kick the can down the road to future leaders to deal with. This was a big mistake.
The Kims made a big mistake too. They decided on building both ICMS and nuclear weapons, with the goal of being able to hold any nation on the planet hostage to their aims. The USA can not afford to lose any of its major cities. (Insert cynical joke here, based on your politics.) So we will likely be forced to act, even though the West will lose South Korea's economy and wealth in the process.
Strangely, as much as I hate Trump the man, I'm glad that he will let the military make the decisions needed to fight North Korea when the time comes. The military knows he is not competent enough to make decisions required of a commander in chief. So they will act responsibly, but give him enough cover to look presidential.
But what happens after the war? Ay, there's the rub. In order to limit the damage, South Korea will need to be protected from reunification. Since the North Korean people have been brainwashed to worship the Kim family, it will be a great effort and risk to absorb this useless population into a South Korea that will be trying to rebuild a country after a major war. They will want (but never saying this) as many primates as possible exterminated between the DMZ and the Yalu river (the Chinese Border). This means that South Korea has an interest in America to test and use as many of its military toys as possible in that war. And our military will only be too glad to oblige.,
Am I being overly cynical and pessimistic? Maybe. But I haven't thought of any other possible solution that could occur with less bloodshed and suffering....