Pyongyang expected to release five-year development plan for defence and economy at upcoming congress.

North Korean leader Kim Jong Un will unveil plans to bolster the country’s nuclear forces at an upcoming governing party meeting, state media reported.

The report from the Korean Central News Agency (KCNA) on Wednesday came the day after Kim oversaw the latest in a series of missile tests that have unsettled the region. Kim has ordered the “expansion” and modernisation of the country’s missile production.

Details, which Kim has warned will bring “excruciating mental agony” to his enemies, are expected to be released at the upcoming ninth Communist Party congress, which is due to take place in the coming weeks.

At the meeting, the first such gathering since 2021, the governing party will unveil a five-year development plan for defence and the economy.

Kim described Tuesday’s test-firing of a large-calibre multiple rocket launcher system as of “great significance in improving the effectiveness of our strategic deterrent” and said it showed the weapon system could be used for “specific attacks”, KCNA reported.

The missiles that were fired “hit a target” in waters at a distance of 358.5km (222.7 miles), the North Korean leader declared.

The missiles were fired in the direction of the Sea of Japan, also known as the East Sea. Two landed outside North Korea’s Exclusive Economic Zone, Japanese state news agency Jiji Press reported, citing Defence Ministry sources.

South Korea’s military reported that it detected multiple short-range ballistic missiles launched from north of Pyongyang towards the Sea of Japan.

“The result and significance of this test will be a source of excruciating mental agony and serious threat to the forces that attempt to provoke a military confrontation with us,” Kim said.

Analysts told South Korea’s Yonhap news agency that the “self-steered precision guided flight system” mentioned by Kim may indicate a new navigation system employed to help the weapon defy global positioning system (GPS) jamming.

Photos showed Kim’s daughter, Kim Ju Ae, accompanying him to the test, along with Kim Jong-sik, first vice department director of the party’s central committee, and Jang Chang-ha, chief of the Missile Administration, Yonhap reported.

While acknowledging that development of the rocket launcher system had “not been plain sailing”, Kim said the test was “of great significance in improving the effectiveness of our strategic deterrent”.