I spent last week at a conference in South Korea, during which time Donald Trump went from seeking a meeting with North Korean leader Kim Jong Un to cancelling it, then suggesting it might be back on.
"What does Trump want?" South Korean officials at the conference kept asking me. Notably, no one asked what the United States wants. They knew it was all about Mr. Trump.
Mr. Trump's goal has nothing to do with peace on the Korean Peninsula, or even with making America great again. It's all about making Trump feel great.
"They are respecting us again," Mr. Trump exulted to graduating cadets at the U.S. Naval Academy last Friday. "Winning is such a great feeling, isn't it? Nothing like winning. You got to win."
In truth, the United States hasn't won anything, in Korea or anywhere else. After 16 months of Mr. Trump at the helm, America is far less respected around the world than it was before.
The only thing that's happened is Mr. Trump is now making foreign policy on his own -- without America's allies, without Congress, even without the State Department. Mr. Trump may consider this a personal win, but it hardly makes America safer.
Some earnest foreign policy experts are seeking to discover some bargaining strategy behind Mr. Trump's moves on North Korea. Hint: There's no strategy. Only a thin-skinned narcissist needing flattery and fearing ridicule.
Mr. Trump got excited about a summit with Mr. Kim when he thought it might win him praise, even possibly a Nobel Peace Prize. He got cold feet when he feared Mr. Kim might be setting him up for humiliating failure. Now he's back to dreaming about the Peace Prize.
The delicate balance in Mr. Trump's brain between glorification and mortification can tip either way at any moment, depending on his hunches. All international relations become contests of personal dominance.
He rejected the 2015 Iran nuclear deal for no apparent reason other than that former President Barack Obama had entered into it. Mr. Trump couldn't care less that by doing so he has harmed relations with our traditional allies, who pleaded with him to stay in. And he's undermined America's future credibility. Why would any nation (including North Korea) enter into an agreement with the United States if it can break it on the whim of a president who wants to one-up his predecessor?
Ditto with the Paris climate accord. Mr. Obama got credit for it, so Mr. Trump wants credit for unilaterally sinking it.
Mr. Trump has demanded that America's nuclear arsenal be upgraded. Why? Since 1970, the United States has been committed to nuclear nonproliferation. What changed? Mr. Trump. A more powerful arsenal makes him feel more powerful -- "respected again."
It's not about American interests in the world. It's about Mr. Trump's interests.
Wonder why Mr. Trump promised to lift trade sanctions on ZTE, China's giant telecom company? ZTE has been trading with North Korea and Iran, in violation of American policy. Everyone around Mr. Trump advised against lifting the sanctions.
Look no further than Mr. Trump's personal needs. ZTE is important to China, and China recently pledged a half-billion-dollar loan to a project connected to the Trump Organization.
While we're on the subject of high-tech, why has Mr. Trump pushed the Postal Service to double the shipping rate it charges Amazon? I mean, isn't Amazon important to America's high-tech race with the rest of the world?
The most likely explanation is that the CEO of Amazon is Jeff Bezos, who's far richer than Mr. Trump. Mr. Bezos also owns The Washington Post, and The Post has been critical of Mr. Trump.
As you may have noticed, the man doesn't like to be criticized. As Mr. Trump explained to Leslie Stahl of "60 Minutes" during his campaign, his aim is "to discredit you all and demean you all so when you write negative stories about me no one will believe you."
Any halfway responsible president of the United States would be worried about Russian meddling in U.S. elections. Protecting American democracy is just about the most important thing a president does.
But Mr. Trump has turned the Russia inquiry into a "dark state" conspiracy against him. And he's demanded that the Justice Department investigate the people who are investigating him.
With Mr. Trump, there's no longer American foreign policy. There's only Mr. Trump's ego.
If peace is truly advanced on the Korean Peninsula, the Nobel Peace Prize shouldn't go to Mr. Trump. It should go to South Korean President Moon Jae-in, who has tirelessly courted the world's two most dangerous megalomaniacs.
Robert Reich's latest book is "The Common Good," and his most recent documentary is "Saving Capitalism."