In her first known official statement, the younger sister of North Korean leader Kim Jong Un levelled diatribes and insults against South Korea for raising concern over her country's latest live-fire exercises.
Kim Yo Jong is in charge of propaganda affairs for North Korea and has frequently appeared at her brother's major public events, including summits with President Donald Trump and other regional leaders.
But her statement carried by state media was the first of its kind and indicated a further elevation of her political status.