Kim oversees missile tests as N Korea boosts maritime security

North Korean leader Kim Jong Un oversaw the test firing of a "new-type surface-to-sea missile", state media reported Thursday, part of a purported fresh drive to ramp up maritime border security.

So far this year, Kim has declared South Korea his country's "principal enemy", jettisoned agencies dedicated to reunification and outreach, and threatened war over "even 0.001 mm" of territorial infringement.

Pyongyang has also doubled-down on weapons tests, including launching a string of cruise missiles, testing an "underwater nuclear weapon system", and firing a solid-fuelled hypersonic ballistic missile.

Seoul's military said Wednesday that it had detected the launch of multiple cruise missiles by the North.

The official Korean Central News Agency said leader Kim had overseen the "evaluation test-fire of new-type surface-to-sea missile Padasuri-6 to be equipped by the navy".

Kim expressed "great satisfaction over the results of the test-fire", KCNA added.

The missiles hit their intended targets after flying over the East Sea for 1,400 seconds, it said.

Kim said South Korea let "various kinds of battleships intrude into the waters of the DPRK to seriously encroach upon its sovereignty", referring to the North by its official acronym.

The maritime border between the two countries, known as the Northern Limit Line, has never been officially demarcated, and has been the site of previous clashes between the two Koreas.

Kim decried Seoul's "desperate efforts to preserve 'northern limit line,'" and vowed that the North would "thoroughly defend the maritime sovereignty by force of arms and actions, not by any rhetoric."

Earlier this year, Kim said he would no longer recognise the Northern Limit Line, and...