People watch a TV news programme reporting North Korea’s announcement with file image at the Seoul Railway Station in Seoul, South Korea, Sunday, Dec. 8, 2019. North Korea said Sunday it carried out a “very important test” at its long-range rocket launch site that it reportedly rebuilt after having partially dismantled it after entering denuclearisation talks with the United States last year. (AP Photo/Lee Jin-man)

SEOUL – North Korea has carried out a “very important” test at its Sohae satellite launch site, state media KCNA reported on Sunday, a rocket testing ground that U.S. officials once said North Korea had promised to close.

The reported test comes as a year-end deadline North Korea has imposed nears, warning it could take a “new path” amid stalled denuclearisation talks with the United States. The KCNA report called it a “successful test of great significance” but did not specify what was tested.

South Korea’s Joint Chiefs of Staff, which usually issues alerts if a missile is seen launching from North Korea, declined to comment.

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.