SOUTH KOREAN OFFICIALS have said North Korea has blown up an inter-Korean liaison office building just north of the border between the two countries.

Seoul’s unification ministry said the destruction of the building at the North Korean border town of Kaesong took place at 2.49pm local time (6.49am Irish time).

North Korea had earlier threatened to demolish the building as it stepped up its rhetoric over Seoul’s failure to stop activists from flying propaganda leaflets across the border.

Some experts say North Korea is expressing its frustration because Seoul is unable to resume joint economic projects due to US-led sanctions.

North Korea’s military has recently threatened to move back into zones that were demilitarised under inter-Korean peace agreements.

The General Staff of the Korean People’s Army (KPA) said it is reviewing a ruling party recommendation to advance into unspecified border areas that had been demilitarised under agreements with the South, which would “turn the front line into a fortress”.

The powerful sister of North Korean leader Kim Jong-un days earlier said the North would demolish the “useless” inter-Korean liaison office in the border town of Kaesong and that she would leave it to the military to come up with the next step of retaliation against the “enemy” South.

“Our army is keeping a close watch on the current situation in which the (North-South) relations are turning worse and worse, and getting itself fully ready for providing a sure military guarantee to any external measures to be taken by the party and government,” the KPA’s General Staff Department said.

It said it was studying an “action plan for taking measures to make the army advance again into the zones that had been demilitarised under the (North-South) agreement, turn the front line into a fortress and further heighten the military vigilance against (the South)”, according to the statement carried by the North’s official Korean Central News Agency.

2018 deal 

While it was not immediately clear what actions North Korea’s military might take against the South, the North has threatened to abandon a bilateral military agreement reached in 2018 to reduce tensions across the border.

The Koreas then committed to jointly take steps to reduce conventional military threats, such as establishing border buffers on ground and sea and no-fly zones.

They also removed some front-line guard posts in a symbolic gesture. The North’s statement possibly implies that it would no longer respect the buffer zones and that the guard posts would be rebuilt.

South Korean soldiers patrol along the barbed-wire fence in Paju, South Korea, near the border with North Korea, yesterday. Ahn Young-joon / AP/Press Association Images Ahn Young-joon / AP/Press Association Images / AP/Press Association Images

The North’s military also said it would open unspecified areas near the ground border and its southwestern waters so that North Koreans could send anti-South Korea propaganda leaflets to the South, in an apparent tit-for-tat against North Korean defectors and activists floating anti-Pyongyang leaflets across the border.

This could potentially create security headaches for the South if North Korean military vessels escort North Korean civilian boats as they approach or cross the countries’ disputed western maritime border for leafleting, said Kim Dong-yub, an analyst from Seoul’s Institute for Far Eastern Studies and a former South Korean military official.

Choi Hyun-soo, spokeswoman of South Korea’s Defence Ministry, said the South Korean and US militaries were closely monitoring the North’s military and that the inter-Korean military agreement should be kept.

Recently announced as her brother’s top official on inter-Korean affairs, Kim Yo-jong in recent weeks has repeatedly bashed South Korea over declining bilateral relations and its inability to stop leafleting by defectors and activists.

North Korea in recent months has suspended virtually all cooperation with the South while expressing frustration over the lack of progress in its nuclear negotiations with Washington.

The talks have faltered with the Americans rejecting North Korean demands for major sanctions relief in exchange for a partial surrender of its nuclear capabilities.

The North has also threatened to abandon bilateral peace agreements reached during Kim Jong-un’s three summits with South Korean President Moon Jae-in in 2018, while also expressing frustration over Seoul’s unwillingness to defy US-led international sanctions and restart inter-Korean economic cooperation.

Moon yesterday called on North Korea to stop raising animosities and return to talks, saying that the rivals must not reverse the peace deals.