Donald J. Trump did it.

He went to the United Nations, an international body with a mission that aims to seek peaceful resolutions to world problems, and declared this:

“Now North Korea’s reckless pursuit of nuclear weapons and ballistic missiles threatens the entire world with unthinkable loss of human life … The United States has great strength and patience, but if it is forced to defend itself or its allies, we will have no choice but to totally destroy North Korea. Rocket Man is on a suicide mission for himself.”

It was the U.S. president’s premiere visit to the U.N. He stood at the podium in front of the world’s leaders and diplomats and all but declared war on North Korean dictator Kim Jong Un.

Trump turns up the volume on Kim.

Do you feel safer now? Do you feel as though Kim is going to back off his threats? Is he going to dismantle his budding nuclear arsenal based on what he heard the president of the United States say to — and about — him?

Let me think about that. Uh, no, no and … no.

Rocket Man? Are you serious? That’s what the president called Kim at the U.N. It’s a nickname that was born in a Trump tweet just the other day. The president took that juvenile name-calling to the world’s greatest international deliberative body. Well done, Mr. President … not!

I know the U.N. has its critics. Much of the criticism is deserved. It has many times over the years scolded the wrong nations and embraced others. As the president noted correctly this morning, the U.N. has placed nations with abysmal human rights records on its human rights councils.

The international body’s primary mission, though, is to promote peaceful resolutions to international crises. To hear the president of the United States threaten a member U.N. nation with “total destruction” is chilling in the extreme.