So North Korea apparently scrapped a nuke by exploding it. Diplomacy - well, the versions of diplomacy that were used on North Korea - was apparently no full success.
That's not terribly surprising or uneasy for a modest man. No tool works every time. You're not always able to win.
Most importantly: Diplomacy is no tool that promises to impose one's own will on others EVERY TIME.
Yet, some people have a serious illusion of omnipotence.
They expect their country to succeed in influencing other countries every time.
The concept of sovereignty is a strange thing, isn't it? Well, it is - at least to them.
There's just one interpretation of events for such ignorant people: Diplomacy was a failure, now let's bomb or invade! (For obvious reasons, I won't link to such diarrhoea.)
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This strain of extremism is in my opinion virulent in the USA and also alive in European nations like the UK, mostly in a minority. Many Hindu Indians, the Israeli right wing and many religious extremists seem to be infected as well. Supposedly extremist countries like Saudi-Arabia, Iran, North Korea are harmless by comparison, as their extremism is mostly limited to self-preservation.
It's no wonder that again and again supposedly civilized Western countries are in the top 10 of threats to world peace polls.
We need to learn that we cannot always have our own way. Humans are supposed to learn that at the age of about four, but too many of us apparently didn't learn it.
Several Western societies as a whole need to learn modesty and respect for ALL other nations. That's what we agreed to when we signed the Charter of the United Nations.
The way to go is to marginalize extremists - left and right, up and down. It's an effective cure for many illnesses that plague Western societies, and it's promising in this case as well.
That alone won't be enough if a lack of modesty and respect is a mainstream trait. Such countries need to grow up.
No matter how large, populous or rich your country is - you cannot always win.
You won't always win even if you're ready to compromise for win-win agreements.
There are limits to one's abilities, and grown-ups accept that.
A principle in personnel affairs, the Peter principle, says "In a Hierarchy Every Employee Tends to Rise to His Level of Incompetence." It can be observed in all organizations.
This principle seems to work in international affairs as well. States spend a lot of effort in pursuit of their interests (or the interests of their agents). They will eventually reach too far and fail.
It's entirely natural. No person and no state is omnipotent. Shit happens.
No matter how mighty you or your nation are - you can and will exceed the limit once in a while and fail.
Grown-up, modest people without delusions of grandeur can live with such an insufficiency. They are unlikely to draw wrong conclusions about the tool that failed and will instead use the experience to avoid a repetition of their error.