In his 2018 New Year Speech, Kim said that he was open to dialogue with South Korea with a view to take part in the upcoming Winter Olympics in the South. The Seoul–Pyongyang hotline was reopened after almost two years. North and South Korea marched together in the Olympics opening ceremony and fielded a united women's ice hockey team. In addition to the athletes, Kim sent an unprecedented high-level delegation headed by his sister, Kim Yo-jong, and de facto head of state Kim Yong-nam, including performers such as the Samjiyon Orchestra. On 5 March, he arranged a meeting with South Korea's Chief of the National Security Office, Chung Eui-yong. Chung then traveled to Washington and passed on an invitation to U.S. President Donald Trump to meet with Kim, which Trump accepted.