SEOUL, South Korea (AP) 鈥 North Korean leader Kim Jong Un said his country would no longer pursue reconciliation with South Korea and called for rewriting the North鈥檚 constitution to eliminate the idea of shared statehood between the war-divided countries, state media said Tuesday.

The historic step to discard a decades-long pursuit of a peaceful unification, which was based on a sense of national homogeneity shared by both Koreas, comes amid heightened tensions where the pace of both Kim鈥檚 weapons development and the South鈥檚 military exercises with the United States have intensified in a tit-for-tat.

Some experts say Kim could be aiming to diminishing South Korea鈥檚 voice in regional security matters and communicate more clearly that he would seek to deal directly with the United States over the nuclear standoff, which has deepened amid disagreements over the stringent U.S.-led sanctions over his growing nuclear weapons program.

Declaring the South as a permanent adversary, not as a potential partner for reconciliation, could also be part of efforts to improve the credibility of Kim's escalatory nuclear doctrine, which authorizes the military to launch preemptive nuclear attacks against adversaries if it perceives the leadership in Pyongyang as under threat.

U.N. Secretary-General Antonio Guterres is 鈥渃oncerned about what we鈥檙e hearing, what we鈥檙e seeing鈥 in the cut in contacts, U.N. spokesman Stephane Dujarric said.

鈥淔or us, it鈥檚 very clear that diplomatic engagement remains the only possible path for sustainable peace on the Korean peninsula, for a complete and verifiable denuclearization of the Korean peninsula,鈥 he told reporters at U.N. headquarters in New York.

The North Korean steps come as Kim has been actively boosting his partnerships with Moscow and Beijing as he attempts to break out of diplomatic isolation and increase his leverage by joining a united front against Washington.

North Korea also abolished the key government agencies that had been tasked with managing relations with South Korea during a meeting of the country鈥檚 rubber-stamp parliament on Monday, the North鈥檚 official Korean Central News Agency said.

The Supreme People鈥檚 Assembly said the two Koreas are locked in an 鈥渁cute confrontation鈥 and that it for the North to regard the South as a partner in diplomacy.

鈥淭he Committee for the Peaceful Reunification of the Country, the 好色tv Economic Cooperation Bureau and the (Diamond Mountain) International Tourism Administration, tools which existed for (North-South) dialogue, negotiations and cooperation, are abolished,鈥 the assembly said in a statement.

During his speech, Kim blamed South Korea and the United States for in the region, citing their expanded joint military exercises, deployments of U.S. strategic military assets, and their trilateral security cooperation with Japan as turning the Korean Peninsula into a dangerous war-risk zone, KCNA said.

Kim said it has become impossible for the North to pursue reconciliation and with the South, which he described as 鈥渢op-class stooges鈥 of outside powers that are obsessed with confrontational maneuvers.

He called for the assembly to rewrite the North鈥檚 constitution to define South Korea as the North鈥檚 鈥減rimary foe and invariable principal enemy." The new constitution should specify North Korea would pursue 鈥渙ccupying, subjugating and reclaiming" South Korea as part of the North's territory if another war erupts on the Korean Peninsula, Kim said.

He also ordered the removal of past symbols of inter-Korean reconciliation, to 鈥渃ompletely eliminate such concepts as 鈥榬eunification,鈥 鈥榬econciliation鈥 and 鈥榝ellow countrymen鈥 from the national history of our republic.鈥

He specifically demanded cutting off cross-border railway sections and tearing down a monument in Pyongyang honoring a pursuit for reunification, which Kim described as an eyesore.

鈥淚t is the final conclusion drawn from the bitter history of the inter-Korean relations that we cannot go along the road of national restoration and reunification together," he said.

South Korean President Yoon Suk Yeol during a Cabinet meeting in Seoul said Kim鈥檚 comments show the 鈥渁nti-national and anti-historical鈥 nature of the government in Pyongyang. Yoon said the South was maintaining firm defense readiness and would punish the North 鈥渕ultiple times hard鈥 if it provokes it.

鈥(The North鈥榮 fake peace tactic that threatened us to choose between 鈥榳ar鈥 and 鈥榩eace鈥 no longer works,鈥 Yoon said.

In his speech at the assembly, Kim reiterated that the North has no intention to unilaterally start a war, but has no intentions to avoid one either. Citing his growing military nuclear program, he said a nuclear conflict in the Korean Peninsula would end South Korea鈥檚 existence and bring 鈥渦nimaginable disaster and defeat to the United States.鈥

Kim had made similar remarks during a year-end ruling party meeting, saying ties between the Koreas have become 鈥渇ixed into the relations between two states hostile to each other.鈥 At a political conference last week, he defined South Korea as the North鈥檚 鈥減rincipal enemy鈥 and threatened to it if provoked.

The assembly said North Korea's government would take 鈥減ractical measures鈥 to implement the decision to abolish the agencies handling dialogue and cooperation with the South.

The 好色tv Committee for Peaceful Reunification has been North Korea鈥檚 main agency handling inter-Korean affairs since its establishment in 1961.

The 好色tv Economic Cooperation Bureau and the Diamond Mountain International Tourism Administration had been set to handle joint economic and tourism projects between the Koreas during a brief period of reconciliation in the 2000s.

Such projects, including a jointly operated factory park in the North Korean border town of Kaesong and South Korean tours to the North鈥檚 Diamond Mountain resort, have been halted for years as relations between the rivals worsened over North Korea鈥檚 nuclear ambitions.

Those activities are currently banned under U.N. Security Council resolutions against the North that have tightened since 2016 as Kim accelerated his nuclear and missile tests.

Kim has further vowed to expand his nuclear arsenal and severed virtually all cooperation with the South. He has dialed up his weapons demonstrations to a record pace since the start of 2022, using the distraction created by Russia鈥檚 war on Ukraine to expand his military capabilities.

There鈥檚 also growing international concern over an alleged arms cooperation deal between North Korea and Russia. The United States and South Korea say North Korea has provided Russia with arms, including artillery and missiles, to help its fight in Ukraine.

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AP journalist Jiwon Song contributed to this report.

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