SEOUL, South Korea — North Korea claimed on Monday that it had successfully tested a new type of nuclear-capable missile, one that uses a solid-fuel technology that American experts say will make it easier for the country to hide its arsenal underground and roll its missiles out for quick launch.

The test took place on Sunday (Saturday evening in the United States) and was dramatic enough that aides to President Trump and Prime Minister Shinzo Abe of Japan interrupted their dinner at the Mar-a-Lago resort in Florida to bring them early reports of the launch.

Initially there was concern that North Korea’s leader, Kim Jong-un, had made good on his threat to test an intercontinental ballistic missile, which one day may be able to reach the United States. Before dinner was over, it was clear that was not the case.

North Korea’s news service, KCNA, announced that the launch involved a new missile, called the Pukguksong-2, which appears to be based on the design of a submarine-launched missile it tested last year.