North Korea's Hwasong-15 missile is said by its media to be able to hit all the US territory. (Photo: KCNA)

South Korea’s National Security Office chief Chung Eui-yong, US National Security Adviser H.R. McMaster, and Japan’s National Security Adviser Shotaro Yachi discussed a summit meeting between North Korean leader Kim Jong Un and South Korean President Moon Jae-in and a possible meeting between Kim and US President Donald Trump. The three advisers agreed that “it is important to not repeat the mistakes of the past” and to work together closely.