 This came after Pyongyang had repeatedly warned Seoul regarding matters such as the failure of the South to stop North Korean expatriate activists from sending anti-regime propaganda leaflets across the border.The Korean Central News Agency described it as "the first step of the determination to completely shut down all contact means with South Korea and get rid of unnecessary things".The sister of Kim Jong-un, Kim Yo-jong, as well as the Vice Chair of the Central Committee of the ruling Workers' Party of Korea, Kim Yong-chol, stated that North Korea had begun to treat South Korea as its enemy.