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The reported test comes ahead of a year-end deadline North Korea has imposed for the United States to drop its insistence on unilateral denuclearization. Pyongyang has warned it could take a “new path” amid the stalled talks with the United States.

“North Korea, under the leadership of Kim Jong Un, has tremendous economic potential, but it must denuclearize as promised,” Trump said on Twitter.

The KCNA report called it a “successful test of great significance” but did not specify what was tested.

This could be a very credible signal of what might await the world after the New Year.

Missile experts said it appeared likely the North Koreans had conducted a static test of a rocket engine, rather than a missile launch.

“If it is indeed a static engine test for a new solid or liquid fuel missile, it is yet another loud signal that the door for diplomacy is quickly slamming, if it isn’t already,” said Vipin Narang, a nuclear affairs expert at the Massachusetts Institute of Technology in the United States.

“This could be a very credible signal of what might await the world after the New Year.”

Tensions have risen ahead of a year-end deadline set by North Korea, which has called on the United States to change its policy of insisting on Pyongyang’s unilateral denuclearization and demanded relief from punishing sanctions.

On Saturday North Korea’s ambassador to the United Nations said denuclearization was now off the negotiating table with the United States and lengthy talks with Washington are not needed.

“The results of the recent important test will have an important effect on changing the strategic position of the DPRK once again in the near future,” KCNA reported, using the initials of North Korea’s official name, the Democratic People’s Republic of Korea.