The defector crossed the military demarcation line separating the two countries and was spotted by surveillance equipment, South Korea's Joint Chiefs of Staff said in a statement.
South Korean and United States soldiers stand guard at the truce village of Panmunjom, July 2017.
Pompeo, who is leading the team of US negotiators, traveled to Pyongyang in October, where he and the North Korean leader agreed to a second US-North Korea summit.
"The sanctions exemption has big implications given that the project has garnered recognition and support from the United States and the global society", South Korea's presidential spokesperson Kim Eui-kyeom said at the time. The last defection involving North Koreans occurred in May when two civilians aboard a small boat fled to the South across the Yellow Sea.
According to CNN, President Moon Jae-in has "long dreamed" of building a trans-Korean railroad because of the economic benefits that would result in being more easily connected to China and Russian Federation.
In November 2017, a North Korean soldier dashed through a hail of bullets fired by his fellow troops to enter the South through Panmunjom, the so-called truce village that straddles the border.
At Dorasan, Minister of Land, Infrastructure and Transport Kim Hyun-mee said "Today's ceremony will be a flare that signals the beginning of co-prosperity of the South and North, and will become a catalyst that expands the economic boundaries of the Korean Peninsula, which was isolated like an island, to Eurasia".
For the first time since the recent elimination of border guards on the divided peninsula, a North Korean soldier has fled to the south.
They have begun work to reconnect their railway systems, removed landmines and destroyed military bunkers at parts of the frontier.
Moon's top press secretary, Yoon Young-chan, was quoted by the South's Yonhap news agency saying that Trump "asked that South Korea and the US closely cooperate so the next summit will be another historical milestone in the process of denuclearizing the Korean Peninsula". "Nothing has been decided", Blue House spokesperson Kim Eui-kyeom told reporters, according to South Korea's Yonhap News Agency.
The Koreas plan to hold a groundbreaking ceremony by the end of the year on an ambitious project to connect their railways and roads as agreed by their leaders.
The Koreas reached the military agreement during the third summit between Kim and South Korean President Moon Jae-in as part of a diplomatic offensive that began earlier this year, reversing months of rising tensions that had threatened to erupt in a nuclear war.