金與正
On 9 June 2020, North Korea began cutting off all of its communication lines with South Korea. 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. A week prior to these actions, Kim Yo-Jong had called North Korean defectors "human scum" and "mongrel dogs". The severing of communication lines substantially diminished the agreements that were made in 2018. On 13 June, Kim Yo-jong, warned that "before long, a tragic scene of the useless North-South joint liaison office completely collapsed would be seen." On 16 June, the North threatened to return troops that had been withdrawn from the border to posts where they had been previously stationed. Later that day, the joint liaison office in Kaesong was blown up by the North Korean government. Due to the COVID-19 pandemic, the South Korean delegation had departed from the building in January. On 5 June 2020, the North Korean foreign minister Ri Son-gwon said that prospects for peace between North and South Korea, and the U.S., had "faded away into a dark nightmare". On 21 June 2020, South Korea urged North Korea to not send propaganda leaflets across the border. The request followed the North's statement that it was ready to send 12 million leaflets, which could potentially become the largest psychological campaign against South Korea.