South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk, right, meets with Director-General of the Asian and Oceanian Affairs Bureau of the Ministry of Foreign Affairs of Japan Takehiro Funakoshi during their bilateral meeting at a hotel in Seoul, Monday, June 21, 2021. (Jung Yeon-Je/Pool Photo via AP)

From left, U.S. special representative for North Korea Sung Kim, South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk and Japanese Foreign Ministry's Director-General of the Asian and Oceanian Affairs Bureau Takehiro Funakoshi pose for a photo during their trilateral meeting at a hotel in Seoul Monday, June 21, 2021. (Jung Yeon-je/Pool Photo via AP)

U.S. special representative for North Korea Sung Kim, center, speaks to South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk and Japanese Foreign Ministry's Director-General of the Asian and Oceanian Affairs Bureau Takehiro Funakoshi during their trilateral meeting at a hotel in Seoul Monday, June 21, 2021. (Jung Yeon-je/Pool Photo via AP)

U.S. special representative for North Korea Sung Kim, speaks to South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk during their bilateral meeting at a hotel in Seoul Monday, June 21, 2021. (Jung Yeon-je/Pool Photo via AP)

South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk, right, poses with Director-General of the Asian and Oceanian Affairs Bureau of the Ministry of Foreign Affairs of Japan Takehiro Funakoshi during their bilateral meeting at a hotel in Seoul, Monday, June 21, 2021. (Jung Yeon-Je/Pool Photo via AP)

U.S. special representative for North Korea Sung Kim, left, and South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk pose for a photo during their bilateral meeting at a hotel in Seoul Monday, June 21, 2021. (Jung Yeon-je/Pool Photo via AP)

A protester stands to denounce policies of the United States on North Korea near the U.S. Embassy in Seoul, South Korea, Monday, June 21 2021. U.S. President Joe Biden's special envoy for North Korea said Monday he hopes to see a positive reaction from the North soon on U.S. offers for talks after the North Korean leader ordered officials to prepare for both dialogue and confrontation. (AP Photo/Ahn Young-joon)

U.S. special representative for North Korea Sung Kim, left, talks with South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk, right, during their bilateral meeting at a hotel in Seoul Monday, June 21, 2021. (Jung Yeon-je/Pool Photo via AP)

U.S. special representative for North Korea Sung Kim, left, talks with South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk, center, and Japanese Foreign Ministry's Director-General of the Asian and Oceanian Affairs Bureau Takehiro Funakoshi, right, during their trilateral meeting at a hotel in Seoul Monday, June 21, 2021. (Jung Yeon-je/Pool Photo via AP)

South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk, right, poses with Director-General of the Asian and Oceanian Affairs Bureau of the Ministry of Foreign Affairs of Japan Takehiro Funakoshi during their bilateral meeting at a hotel in Seoul, Monday, June 21, 2021. (Jung Yeon-Je/Pool Photo via AP)

U.S. special representative for North Korea Sung Kim, left, and South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk pose for a photo during their bilateral meeting at a hotel in Seoul Monday, June 21, 2021. (Jung Yeon-je/Pool Photo via AP)

South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk, right, meets with Director-General of the Asian and Oceanian Affairs Bureau of the Ministry of Foreign Affairs of Japan Takehiro Funakoshi, left, during their bilateral meeting at a hotel in Seoul, Monday, June 21, 2021. (Jung Yeon-Je/Pool Photo via AP)

South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk speaks to U.S. special representative for North Korea Sung Kim and Japanese Foreign Ministry's Director-General of the Asian and Oceanian Affairs Bureau Takehiro Funakoshi during their trilateral meeting at a hotel in Seoul Monday, June 21, 2021. (Jung Yeon-je/Pool Photo via AP)

Japanese Foreign Ministry's Director-General of the Asian and Oceanian Affairs Bureau Takehiro Funakoshi speaks to South Korea's Special Representative for Korean Peninsula Peace and Security Affairs Noh Kyu-duk and U.S. special representative for North Korea Sung Kim during their trilateral meeting at a hotel in Seoul Monday, June 21, 2021. (Jung Yeon-je/Pool Photo via AP)