Seoul: North Korea Leader Kim Jong-un inspected the successful test of a new unspecified “high-tech tactical” weapon amidst stalled talks with the United States over the denuclearisation of the Korean peninsula, said reports on Friday. (Also read: North Korea Cancelled Pompeo Talks: US Ambassador)

“Kim Jong Un…visited the test ground of the Academy of Defence Science and supervised a newly developed ultramodern tactical weapon test,” said the official Korean Central News Agency (KCNA). While it is said the test was successful, it did not specify the type of device involved.

Pyongyang’s suspension of testing for nuclear weapons and ballistic missiles has been key to this year’s rapid diplomatic developments and North Korean-US negotiations and has been repeatedly praised by President Donald Trump.

Trump and Kim met in a historic summit in Singapore in June, where they signed a vaguely worded document on denuclearisation of the peninsula. Progress has since stalled as Washington and Pyongyang spar over the meaning of the document, and a return to testing would cast grave doubts over the future of the process.

The use of the word “tactical” in the KCNA report suggests that no long-range ballistic rocket or nuclear device was involved, and there were no immediate indications any such test had been detected by the South.

However, one of the senior military officials listed as accompanying Kim was Pak Jong Chon, identified by the specialist website NK Leadership Watch, as head of the Korean People’s Army Artillery Command

Kim expressed “great satisfaction” and said the test marks “decisive turn in bolstering the fighting capacity” of the North’s military, KCNA said. The “ultramodern tactical weapon” had been developed over a long period and its “great success serves as another striking demonstration of the validity of the Party policy of prioritising defence science and technology and the rapidly developing defence capability”, it added.

The news came almost a year after Pyongyang’s last test of an intercontinental ballistic missile and recalled the repeated announcements of 2017, which included by far its most powerful nuclear blast to date and rockets that brought the whole of the US mainland into range.

Soon afterwards Kim declared the development of his nuclear arsenal — which Pyongyang has long said it needs to defend itself against a possible invasion by the US — complete.

The Winter Olympics in the South then triggered a rapid diplomatic rapprochement on the peninsula, heralding the Singapore meeting and three summits between Kim and South Korean President Moon Jae-in.

A second encounter between Kim and Trump is expected in the new year.

But Pyongyang is demanding sanctions imposed against it over its weapons programmes are eased and has condemned US demands for what it calls its “unilateral” disarmament as “gangster-like”.

After the Singapore summit, Trump announced the suspension of joint military exercises with the South, the United States’ treaty ally, calling them “provocative” in an echo of the North’s condemnations.