In the fraught process of North Korean denuclearization, Pyongyang has hit the ball firmly into the U.S. court by offering to welcome global inspectors to oversee the "permanent" dismantling of its missile-engine test site, and also to shut down its main nuclear complex at Yongbyon.
The North's dictator stated the agreement will help improve relations between the two nations and will bring the countries closer to peace.
Standing by her brother's side as he and Moon signed a denuclearization agreement Wednesday, Kim Jong Un would only use the pen Kim Yo Jong handed him to sign the joint statements.
Ahead of the visit, Moon and his administration said that the goal of the trip was to work toward establishing a lasting peace on the Korean Peninsula.
The North promised to dismantle its Yongbyon nuclear weapons facility as far back as 2007 and the significance of shuttering the two facilities is not clear.
Tycoons from some of South Korea's largest family-run conglomerates accompanied Moon to Pyongyang this week at the request of the South's presidential office, with North Korean officials warmly greeting business leaders including Samsung Electronics vice chairman Jay Y. Lee.
A commentary in the Rodong Sinmun, the mouthpiece of the North's ruling party, repeated the criticism on Tuesday, saying Washington was "totally to blame" for the deadlock.
At Kim's historic summit with US President Donald Trump in Singapore in June - brokered by Moon - he declared his backing for denuclearisation of the peninsula. Whatever happens down the road between Kim and Trump, or Kim and whoever follows Trump, since North Korean leaders tend to outlast American presidents, this is to be regarded as a moment of triumph.
"Through this agreement, the South and the North can practically resume a preliminary level of operational arms control", he said.
Speaking to the press on the outcome of Moon's visit to North Korea, Kim noted that the "agreement at Pyongyang summit will advance an era of peace, prosperity".
Kim has previously committed to working toward denuclearization, in joint statements with both Moon and Trump.
There are two efforts to establish peace with North Korea and, depending on where you are and which one matters most to you, you can feel buoyantly optimistic or anxiously uncertain.
Yoon, South Korea's presidential senior secretary for public communications, said Moon's visit on Wednesday afternoon had been previously scheduled and "simply consists of viewing artworks". "South and North Korea have agreed to collaborate closely with the US and the global community for the final achievement of denuclearization". They will also work to restart a joint factory park in the North border city of Kaesong and tours to the North's Mount Kumgang resort, when conditions are met.