Elise Hu

Updated at 5:05 a.m. ET

Following a historic meeting between North Korea's Kim Jong Un and South Korean President Moon Jae-in, the leaders appeared side by side to make an extraordinary announcement: The two nations — technically in a state of war for more than six decades — would work toward a permanent peace treaty and the elimination of nuclear weapons from the peninsula.

South Koreans have painstakingly planned out the details ahead of North Korea's Kim Jong Un and South Korea's Moon Jae-in's summit at their shared border Friday, the culmination of a flurry of diplomacy over the past few months.

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