The recent meeting between the North Korean and U.S. leaders on the border between the two Koreas marked the end of mutual hostilities between the two countries and the beginning of an era of peace, South Korean President Moon Jae-in said Tuesday, according to the South Korean news agency Yonhap.

During their impromptu third summit, which lasted 53 minutes, in the Demilitarized Zone (DMZ) on Sunday, June 30, President Trump and Kim Jong Un reaffirmed their friendship and agreed to resume talks on the denuclearization of the Korean Peninsula.

Moon said during a meeting with his government that the meeting in the Demilitarized Zone means that the two countries had declared “the end of hostile relations” and the “beginning of an era of peace.”

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Moon spoke briefly with President Trump and Kim in Panmunjom village before the two leaders sat down to a meeting he described as “historic.” He also described the meeting as “the fruit of a surprising imagination,” adding that it was organized after President Trump’s “unprecedented” offer made the day before on Twitter and Kim’s “brave” decision to accept it.

The South Korean president took office in 2017 and has worked hard to establish a diplomatic relationship between Washington and Pyongyang to help reach a peaceful settlement to the North Korean nuclear crisis.

Last year he met with Kim on three occasions, the first two in Panmunjom.

At the beginning of the summit, Trump crossed the concrete blocks that mark the DMZ at Panmunjom after Kim told him that if he did that, he would become the first U.S. president to enter North Korea. After walking several yards north together, they returned south to finalize the meeting.

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Trump said he was “proud” to have crossed the border and thanked Kim for coming to the meeting. For his part, the North Korean leader said that at first he was “very surprised” by the tweet published on Saturday by President Trump in which he proposed a meeting in the Demilitarized Zone, and noted that the meeting took place because the two of them had maintained a “great friendship,” said AP.

Weeks ago they had greeted each other through letters, and Kim even sent a greeting to the president for his birthday, which was June 14.

Trump’s brief passage across the border made history, making him the first sitting U.S. president to step into North Korea.