Landmine Explosion at Border: Is North Korea Expanding Border Control?
Pyongyang and Seoul are exchanging increasingly harsh accusations across the Demilitarised Zone (DMZ) dividing the Korean Peninsula, ten days after three South Korean soldiers were injured by landmines on the southern side of the border.
This latest tension may reflect a broader effort by North Korea to test South Korean resolve while expanding its control to the outer limits of its territory, including areas that have practically been no-man’s-land for over 70 years, according to Choo Jae-woo, a professor of foreign policy at Kyung Hee University, South Korea.
“North Korea revised its constitution in March this year and officially declared its intention to define the absolute geographical boundaries of its state, which includes territory within the DMZ,” said Choo. “They want to maximise their territory and, in my view, they want to push the Military Demarcation Line (MDL), the midpoint of the DMZ, further south. I view the placement of mines on the southern side of that line as a purely political act by the North, an attempt to threaten and intimidate the South.”
Seoul Blames Pyongyang
The three soldiers were part of an 18-person patrol clearing a new path in the DMZ as part of an investigation into North Korean troop activity in the western sector of the zone. The DMZ, a four-kilometre-wide strip, has divided the peninsula since the Korean War ended with an armistice in 1953.
At approximately 11:00 am on 21 September 2026, the patrol was about 10 metres south of the MDL when a mine exploded under a staff sergeant’s foot. A second mine exploded as the unit commander approached to provide assistance. Both soldiers were successfully evacuated and underwent surgery, while a third soldier received treatment for minor injuries.
The South Korean military, conducting a joint investigation with the UN Command, which manages the border armistice, concluded in a report released this week that the mines originated from North Korea.
On Wednesday (30/09), the Joint Chiefs of Staff accused North Korea of planting mines on the southern side of the MDL, a violation of the armistice agreement, and demanded an apology from Pyongyang along with a commitment to halt further fortification along the border.
“This is a blatant violation of the Armistice Agreement and undermines the spirit of the existing agreement between the two Koreas, and it must stop immediately,” said Kang Hyun-woo, director of operations, during a press conference. “North Korea must immediately cease activities that increase tensions on the Korean Peninsula, such as what they call ‘border fortification’. We firmly demand an apology and responsible measures from the North,” added Kang.
In a statement, the UN Command stated it had “concluded that a violation of the Armistice Agreement has occurred. The UN Command is addressing this violation through existing Armistice mechanisms.”
Many South Korean citizens are demanding firmer action, arguing that a failure to respond will be perceived as a sign of weakness from Seoul.
Na Kyung-won, a politician from the conservative opposition People Power Party (PPP), demanded that the South Korean military conduct exercises simulating a “decapitation strike” against North Korean leader Kim Jong Un. She also called for the resumption of propaganda broadcasts via loudspeakers at the border and for allowing dissident groups to launch propaganda-laden balloons towards the North.
Patterns of Border Confrontation
Yu Yong-weon, also from the PPP, told reporters on Wednesday (30/09) that North Korean troops had crossed the MDL approximately 20 times in August and 30 times in September. Each time an incursion was detected, South Korean troops fired warning shots.
An editorial in the Korea JoongAng Daily on Thursday (01/10) stated that North Korea must be