SOUTH Korea has said it is pushing to reset high-level talks with North Korea and will communicate closely with Washington and Pyongyang to increase the chances of a successful summit.

The announcement by Seoul’s National Security Council (NSC) came a day after North Korea threatened to scrap next month’s historic meeting between Donald Trump and Kim Jong Un, saying it has no interest in a “one-sided” affair meant to pressure the North to abandon its nukes.

The North also broke off a high-level meeting with South Korea to protest the US-South Korean military exercises the North has long claimed are an invasion rehearsal.

The North’s surprise announcement seemed to cool what had been an unusual flurry of outreach from a country that last year conducted a provocative series of weapons tests that had many fearing the region was on the edge of war.

Analysts said it is unlikely that North Korea intends to scuttle all diplomacy. More likely, they said, is that it wants to gain leverage ahead of the talks between Kim and Trump, scheduled for June 12 in Singapore.

South Korea, which brokered the talks between Kim and Trump, will “closely mediate using multiple communication channels with the United States and with North Korea so that the North Korea-US summit can proceed successfully,” said the NSC after a meeting chaired by Chung Eui-yong, the top security adviser of South Korean president Moon Jae-in.

The NSC also urged the North to faithfully abide by the agreements reached between Moon and Kim in their summit last month, where they issued a vague vow on the “complete denuclearisation” of their peninsula and pledged permanent peace.

Senior officials from the two Koreas were to sit down at a border village to discuss how to implement their leaders’ agreements to reduce military tensions along their heavily fortified border and improve overall ties before the North cancelled the meeting. In Washington, Trump said the US has not been notified about the North Korean threat to cancel the summit.

“We haven’t seen anything. We haven’t heard anything. We will see what happens,” said Trump.

White House spokeswoman Sarah Huckabee Sanders said the administration is “still hopeful” that the summit will take place, and that threats from North Korea to scrap the meeting were “something that we fully expected”.

She said Trump is “ready for very tough negotiations”, adding that “if they want to meet, we’ll be ready and if they don’t that’s OK”. She said if there is no meeting, the US would “continue with the campaign of maximum pressure” against the North.

North Korean first vice foreign minister Kim Kye Gwan said in a statement carried by state media that “we are no longer interested in a negotiation that will be all about driving us into a corner and making a one-sided demand for us to give up our nukes and this would force us to reconsider whether we would accept the North Korea-US summit meeting”.

He criticised recent comments made by Trump’s top security adviser, John Bolton, and other US officials who have said the North should follow the “Libyan model” of nuclear disarmament and provide a “complete, verifiable and irreversible dismantlement”.

He also took issue with US views that the North should fully relinquish its biological and chemical weapons.

Some analysts say bringing up Libya, which dismantled its rudimentary nuclear program in the 2000s in exchange for sanctions relief, jeopardises progress in negotiations with the North.