North Korea’s leader, Kim Jong-un, announced early Saturday that his country no longer needed to test nuclear weapons or long-range missiles and would close a nuclear test site.

“The nuclear test site has done its job,” Mr. Kim said in a statement carried by North Korea’s state media.

Mr. Kim’s announcement came just days before a scheduled summit meeting with President Moon Jae-in of South Korea; Mr. Kim is also planning to meet with President Trump soon. It was the second time in two days that he made what appeared to be a significant concession to the United States but in reality cemented the status quo. North Korea already had stopped testing its weapons.

Mr. Kim made no mention in his latest remarks of dismantling the nuclear weapons and long-range missiles North Korea has already built. On the contrary, he suggested he was going to keep them.

Still, Mr. Trump welcomed what Mr. Kim said. “North Korea has agreed to suspend all Nuclear Tests and close up a major test site,” the president said in a Twitter message. “This is very good news for North Korea and the World — big progress! Look forward to our Summit.”