said during a meeting of the UN Security Council that was called at her request that the US was prepared to take "simultaneous steps" with North Korea to achieve peace. But she also warned the North Koreans against conducting further missile tests. Aftermath In May 2020, saying he intended to employ "new policies", Kim met with the Central Military Commission of the Workers' Party and discussed boosting North Korea's nuclear deterrent. The augmentation of conventional artillery was discussed as well. On June 5, 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". He indicated that subsequent to the meeting with Trump, the North's efforts had focused instead on amassing a more "reliable force to cope with the long-term military threats from the U.S.". On June 13, Kim Yo-jong, sister of Kim Jong-un, warned that "before long, a tragic scene of the useless North-South joint liaison office completely collapsed would be seen". On June 16, the North threatened to return troops that had been withdrawn from the border to posts where they had been previously stationed.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 liaison office in Kaesong was blown up by the North Korean government. Due to the COVID-19 pandemic, the South Korean delegation had left the building in January. In September, Moon and Kim exchanged friendly letters about COVID-19 and the typhoons that had hit Korea. On 22 September, Moon addressed the UN General Assembly and called for a "permanent peace regime" in Korea. Kelly Craft, the US ambassador to the UN, backed his call and said that there had been significant progress in negotiations so far. On the same day, the crew of a North Korean patrol boat killed a South Korean fisheries officer whom they encountered off their coast and torched his flotation device. Kim apologized to South Korea for the incident. In November, the South Korean defense ministry reaffirmed its commitment to the peace process in an ASEAN security meeting. In February 2021, South Korea continued to omit North Korea's "enemy" status from the South Korean military's White Paper after downgrading the status of Japan. On March 24, 2022, North Korea broke a self-imposed moratorium and launched its first ICBM since 2017. See also Peace Treaty on Korean Peninsula Korean conflict North Korea and weapons of mass destruction Korean reunification North