During trilateral nuclear talks, U.S. special envoy Sung Kim emphasized that there needs to be a response from Pyeongyang for the resumption of talks.
He was meeting on Monday with his South Korean counterpart Noh Kyu-duk and Japanese counterpart Takehiro Funakoshi.
"We continue to hope that the DPRK will respond positively to our outreach and our offer to meet anywhere, anytime without, preconditions."
But he added that the U.S. will continue to implement UN Security Council resolutions to address North Korea, urging other council members to do the same.
Their meeting follows the message last week from North Korean leader Kim Jong-un who spoke about preparing for both "dialogue" and "confrontation" with the U.S.
During an earlier South Korea-U.S. bilateral meeting, Sung Kim said that the U.S. is still "waiting to hear back from Pyeongyang," adding that it will also be prepared for both dialogue and confrontation.
During the first face-to-face nuclear talks since the start of the Biden administration, the three discussed ways to bring North Korea back to the negotiating table.
"At this critical juncture, this meeting to strengthen the coordination among our three governments and find practical ways to make substantial progress is very timely and will be instrumental to achieving our mutual goal sooner than later."
During a separate South Korea-Japan meeting on Monday, the two sides emphasized Seoul-Tokyo cooperation as well as cooperation between Seoul, Washington, and Tokyo, calling both "essential" for peace and stability in the region.
Seoul's foreign minister Chung Eui-yong on Monday met the U.S. envoy, asking for substantive progress in the Korean peace process through close coordination with South Korea.
On Tuesday, Sung Kim is set to meet with South Korea's unification minister Lee In-young and have talks with a deputy minister at the Unification Ministry.
Yoon Jung-min, Arirang News.