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South Korea warned on Thursday it would take a "proportionate measure" if North Korea resumes propaganda loudspeaker broadcasts along the border, without detailing specifics, while urging Pyongyang to stop acts that could raise the risk of clashes. The unification ministry called on the North to immediately halt border escalation, and Seoul plans to send a letter to the UN Security Council about recent DMZ land mine explosions. In response, Kim Yo-jong, sister of North Korean leader Kim Jong-un, warned of "new counter means" along the border, saying loudspeaker broadcasts against the South will be ready within days. Korean media report the standoff as a sharp escalation, with Yonhap noting Seoul's call for dialogue amid the threat of accidental clashes.