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South Korea has sent a letter to the president of the U.N. Security Council (UNSC) urging North Korea to take responsibility for last month's land mine explosions in the Demilitarized Zone (DMZ) that injured three South Korean soldiers, Yonhap reports. The foreign ministry, through its permanent representative to the U.N., delivered the letter on Oct. 22, calling on Pyongyang to apologize and acknowledge its violation of the Korean War Armistice, according to KBS World and Korea Times. The move follows the Sept. 21 blasts and Pyongyang's escalatory actions near the border, as Seoul seeks international pressure on North Korea.