Moon and Kim, who agreed on a series of steps to improve ties at an April summit, will meet in the North Korean capital of Pyongyang next week, when it is hoped they can help end an impasse between the United States and North Korea.
"A new chapter in history is open here today", South Korean unification minister Cho Myoung-gyon told a ceremony, calling the office "another symbol of peace jointly created by the South and the North".
One reason the president is still optimistic about nuclear disarmament in the Korean Peninsula, reports Glasser, is that Kim keeps sending Trump letters that shower him with flattery and praise.
The resumption of the Kaesong park and other dormant inter-Korean cooperation projects aren't likely to happen anytime soon because US-led worldwide sanctions on North Korea remain in place.
The neighbours are also discussing reconnecting railways and roads, and lessening guard posts along the heavily militarised border.
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Moon's trip will mark his third summit with Kim this year after he orchestrated a rapid diplomatic thaw on the peninsula and brokered June's Singapore summit between the North Korean leader and US President Donald Trump.
Frank Aum, a senior expert at the United States Institute of Peace in Washington, said Moon may need to press North Korea for more definitive steps, such as freezing nuclear and missile production, amid signs that the North is continuing to produce nuclear weapons.
The nuclear-armed North's chief delegate Ri Son Gwon responded in kind, calling it a "substantial fruit nourished by the people of the north and south".
North Korea, which marked the 70th anniversary of the country's founding last Sunday, held several related events in Pyongyang, such as a military parade, mass games and a torch march.
Meanwhile, the two Koreas kicked off working-level talks at the truce village of Panmunjom Friday morning to discuss protocol, security, communications, and media coverage of next week's summit.
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Moon heads to Pyongyang on Tuesday facing lingering questions over his claim that Kim, during his conversations with South Korean officials, has privately expressed a genuine interest in dealing away his nuclear weapons and missiles.
President Donald Trump's advisers are growing increasingly impatient with the "frustratingly slow" progress with North Korea regarding denuclearization, according to The New Yorker, which spoke with half a dozen former USA government officials and allied diplomats who've been briefed by Trump officials on the subject.
But Bolton, known for his hawkish stance against Pyongyang, added, "President Trump can't make the North Koreans walk through the door he is holding open".
In the Thursday briefing to reporters, Moon Chung-in said if he could advise Kim Jong Un during the summit, he would suggest the North Korean leader take the initiative with his own bold move.
A summary of the report obtained in August by the Associated Press also said North Korea has not stopped it nuclear and missile programs, adding the regime has violated United Nations sanctions by transferring coal and flouting an arms embargo.
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