Describing South Korea as an ``enemy,'' Kim Yo Jong repeated an earlier threat she had made by saying Seoul will soon witness the collapse of a ``useless'' inter-Korean liaison office in the border town of Kaesong.

Believed to be in her early 30s, Kim Yo Jong is in charge of propaganda affairs and has frequently appeared at her brother's major public events including summits with U.S. President Donald Trump and other regional leaders.

A North Korean delegation led by a political princess was set to head home Sunday night after a whirlwind three days in South Korea.