SEOUL - North Korean leader Kim Jong Un has threatened South Korea with war if “even 0.001mm” of the North’s territory is violated, as Pyongyang abolished agencies that oversaw cooperation and reunification, state media said on Jan 16.

Mr Kim also said Pyongyang would not recognise the two countries’ de facto maritime border, the Northern Limit Line, and called for constitutional changes allowing the North to “occupy” Seoul in war, the Korean Central News Agency (KCNA) said.

In Seoul, South Korean President Yoon Suk-yeol told his Cabinet that should the nuclear-armed North carry out a provocation, South Korea would hit back with a response “multiple times stronger”, pointing to his military’s “overwhelming response capabilities”.

The hawkish rhetoric on both sides of the border follows a sharp deterioration of inter-Korean ties in recent months, with Pyongyang’s November spy satellite launch prompting Seoul to partially suspend a 2018 military agreement aimed at defusing tensions.

Pyongyang’s decision to jettison the agencies charged with overseeing cooperation and reunification with the South was announced by the North’s Parliament, KCNA said, part of a string of recent measures that have escalated tensions, including live-fire artillery drills and missile launches.

In a speech delivered at the Supreme People’s Assembly, Mr Kim called for drawing up new legal measures to define South Korea as “the most hostile state”, KCNA reported.

“In my opinion, we can specify in our constitution the issue of completely occupying, subjugating and reclaiming the ROK (Republic of Korea) and annex it as a part of the territory of our Republic in case a war breaks out on the Korean peninsula,” Mr Kim said.

The Democratic People’s Republic of Korea and Republic of Korea – the North and South’s official names – were founded 75 years ago, but each still technically regards each other as illegal entities.

“If the Republic of Korea violates even 0.001mm of our territorial land, air and waters, it will be considered a war provocation,” Mr Kim said.

The decision comes shortly after Mr Kim labelled South Korea the “principal enemy” and stated that continuing to seek reconciliation was a “mistake”.

In their constitutions, both North and South Korea claim sovereignty over the whole of the peninsula.

What passed for diplomatic relations between the states was handled by Seoul’s Unification Ministry and Pyongyang’s Committee for Peaceful Reunification – one of the agencies the Supreme People’s Assembly has now declared abolished.

“The two most hostile states, which are at war, are now in acute confrontation on the Korean peninsula,” the decision adopted by the assembly said, according to KCNA.

“The reunification of Korea can never be achieved with the Republic of Korea,” it added.

Analysts said Mr Kim’s shift in approach to the South was “reckless” and a rejection of years of official state policy.

“For decades, North Korea has been telling its people that the completion of the revolution was reunification and that Kim Il Sung’s wish was reunification,” said Korea Institute for National Unification senior research fellow Cho Han-bum, referring to the country’s founding leader and Mr Kim’s grandfather.

“Now (Mr Kim Jong Un) is denying everything that his predecessors have done,” he told AFP.

At Pyongyang’s year-end policy meetings, Mr Kim threatened a nuclear attack on the South and called for a build-up of his country’s military arsenal ahead of armed conflict he warned could “break out any time”.

On Jan 14, the North launched a solid-fuel hypersonic missile, just days after Pyongyang staged live-fire exercises near the country’s tense maritime border with South Korea, which prompted counter-exercises and evacuation orders for some border islands belonging to the South.

Mr Kim also successfully put a spy satellite into orbit late in 2023, after receiving what Seoul said was Russian help, in exchange for arms transfers for Moscow’s war in Ukraine.

Traditional allies Russia and North Korea have boosted ties recently, with Mr Kim making a rare overseas trip to see President Vladimir Putin in Russia’s Far East in September 2023.

On Jan 15, a North Korean government delegation headed by the state’s foreign minister Choe Son Hui arrived in Moscow for an official visit, KCNA reported. AFP