South Korean President Moon Jae-in stressed the need for a second US-DPRK summit. It came just hours after the White House said Kim Jong-un proposed another meeting in a letter to US President Donald Trump. CGTN's Jack Barton has more from Seoul.

JACK BARTON SEOUL "Washington and Pyongyang have been discussing the D.P.R.K.'s nuclear programs since their leaders met in Singapore in June, although that summit's outcome was criticized for being short on details about how and when denuclearization might be achieved. Since then negotiations between the United States and the D.P.R.K. appear to have completely stalled, though South Korean President Moon Jae-in is hoping to help change that when he meets with Kim Jong-un in Pyongyang this month for their third summit this year, though on Tuesday Moon made it clear it will take more than his meeting with Kim to achieve that."

MOON JAE-IN SOUTH KOREAN PRESIDENT "In order for us to move toward the next level of dismantling DPRK's existing nuclear weapons, the leaders of North Korea and the United States once again must have big ideas and take bold decisions. The DPRK should abolish its nuclear programs, and the United States should foster such conditions with corresponding action."

Only hours before Moon made the comments the White House confirmed President Trump had received a letter from Kim Jong-un, which Trump described as "very warm, very positive" suggesting a second summit. The statements coincide with a visit to South Korea by the U.S.'s new nuclear envoy Stephen Biegun, who arrived in Seoul saying there was still much work to do.

JACK BARTON SEOUL "President Moon is making a good start on that work, preparing for his upcoming trip to Pyongyang from September 18 to the 20th by announcing that before the summit even begins a permanent joint liaison office will be opened in the Kaesong industrial area just north of the demilitarized zone, despite claims by some opposition politicians that this would breach current U.N. sanctions. Jack Barton, CGTN, Seoul."