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South Korea's unification ministry on Thursday called on North Korea to stop border escalation acts and return to dialogue, after Pyongyang threatened to resume propaganda loudspeaker broadcasts toward the South. Kim Yo-jong, the North Korean leader's sister, said Wednesday that the broadcasts would resume later this month, warning of "new response measures" along the border. Seoul said it would take a "proportionate measure" if the North follows through, without detailing what that would be. The main opposition People Power Party renewed calls for the government to resume its own loudspeaker broadcasts in protest over recent mine blasts in the Demilitarized Zone. Yonhap reports the ministry urged Pyongyang to immediately stop acts that could increase the risk of clashes.