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South Korean military and lawmakers estimate North Korea has planted about 960,000 land mines inside the Demilitarized Zone since 2024, Yonhap and KBS World report. The figure, based on surveillance analysis of mining methods and frequency, is nearly half the roughly two million mines believed to be buried across the DMZ. Officials link the planting to Pyongyang's 'border fortification' work after it declared South Korea a hostile state, and Seoul has sent a letter to the UN Security Council president over September mine blasts and escalatory actions.