North Korea’s state media said on Sunday that leader Kim Jong Un had overseen a rocket and tactical guided weapons test, after the drill Saturday had raised concerns Pyongyang was escalating provocations with US nuclear negotiations deadlocked.

The North last carried out a missile test in November 2017, before a rapid diplomatic rapprochement saw tensions ease on the peninsula and a series of summits.

A return to missile launches would be likely to infuriate US President Donald Trump, but the North’s official KCNA news agency shied away from the term in its report, saying Kim had ordered a “strike drill” involving “long-range multiple rocket launchers” which are not targeted by UN sanctions resolutions and unspecified “tactical guided weapons”.

The United States and North Korea have been at loggerheads since the collapse of a Trump-Kim summit in February, when the two sides clashed over sanctions and the extent of Pyongyang’s concessions on its atomic arsenal.During Saturday’s drill Kim urged his troops to remember “the iron truth that genuine peace and security are ensured and guaranteed only by powerful strength”, KCNA said.

The state-run Rodong Sinmun newspaper on Sunday carried 16 photos of the weapons test on its front page, including a picture of a grim-looking Kim clutching his binoculars in an observation post as well as several images of projectiles shooting skywards.

Trump proclaimed that the North Korean nuclear threat was over after the two sides’ historic first summit in Singapore in June, when Kim pledged to work towards “complete denuclearisation of the Korean peninsula”.

The two have since disagreed over what that means, but Trump has insisted the leaders remain close even after their follow-up meeting in Vietnam broke up without a deal or even a joint statement, and that Kim would maintain his moratorium on long-range missile and nuclear tests.

The Saturday drill followed last month’s test-firing of very short-range tactical weapons, and came days after a senior North Korean diplomat chastised US Secretary of State Mike Pompeo for making “foolish and dangerous” comments during nuclear talks.

But Ankit Panda of the Federation of American Scientists stressed that the projectile launch “does not violate Kim Jong Un’s self-imposed missile-testing moratorium”, which “only applied to intercontinental-range ballistic missiles”.

Even so, a statement from Seoul’s presidential Blue House said it was “greatly concerned,” calling it a violation of a military agreement signed by both Koreas last year.

On Friday, South Korean Foreign Minister Kang Kyung-wha said Pyongyang should show “visible, concrete and substantial” denuclearisation action if it wants sanctions relief the issue at the centre of the Hanoi debacle.

Earlier this week, North Korean Vice Foreign Minister Choe Son Hui warned Washington of an “unwanted outcome” if it did not adjust its stance on economic sanctions.