South Korea's defense ministry said on Tuesday it has "grave concern" over North Korean threats to deploy more tactical strike weapons along the Demilitarized Zone (DMZ) and to resume propaganda loudspeaker broadcasts aimed at the South. Seoul warned it would "punish resolutely" any further provocation that Pyongyang justifies by pointing to South Korea's own military measures.

The threats came a day earlier in a commentary carried by North Korean state media from Kim Yo-jong, the influential sister of leader Kim Jong-un. She cited specific numbers of South Korean warning shots and warning broadcasts, claiming they had made the border situation "very unstable" and were meant to hamper North Korea's border fortification work. North Korea has been laying mines and building barriers along the frontier since April 2024. Seoul said this month that Pyongyang had sent as many as 7,000 workers to the area this year, and that North Korean personnel had crossed the Military Demarcation Line (MDL), the border's central dividing line, about 50 times.

The defense ministry called its own warning broadcasts and shots "legitimate and defensive measures" under the Armistice Agreement, which halted the 1950-53 Korean War without a formal peace treaty. It said the aim is to stop North Korean troops from violating the MDL and to drive back those who cross it. The ministry urged Pyongyang to drop what it called groundless claims, end the incursions and respond to Seoul's calls to resolve disputes over the border lines. Joint Chiefs of Staff Chairman Jin Young-seung, visiting a frontline army command, ordered operations to strengthen Seoul's initiative in the DMZ. He said North Korea was responsible for mines planted south of the MDL that seriously wounded South Korean soldiers last month, calling it "a clear provocation" and an armistice violation.

The exchange puts at risk a de-escalation step that President Lee Jae Myung has promoted as an early success in his bid to restart diplomacy with the North: the halting of loudspeaker broadcasts across the border. Reviving them would reverse that progress and, as one report noted, raise the possibility of clashes along one of the world's most heavily armed frontiers.

Analysts see a real danger of accidental escalation. Hong Min of the Korea Institute for National Unification said that if North Korea's tolerance threshold falls below South Korea's existing rules of engagement, "the simple repetition of current procedures could be enough to create the conditions for a clash." Michael Bosack, a former UN Command official now at the Parley Policy Institute, warned that troops could mistake warning shots for missed attacks, risking "misinterpretation of intent and potential counterfires."