In the past week, North Korea floated hundreds of huge rubbish balloons on South Korea and allegedly jammed GPS navigation signals in the South. South Korea's national security director Chang Ho-jin said the North's balloon campaign and its GPS signal jamming "absurd, irrational acts of provocation that a normal country can't imagine." He accused North Korea of aiming to cause "public anxieties and chaos" in South Korea. South Korea said it'll soon take "unbearable" retaliatory steps against North Korea over its launch of trash-carrying balloons across the border and other provocations but officials didn't say what retaliatory steps they would take.