On the day South Korean President Moon Jae-in departed for his first summit with U.S. President Joe Biden, progressive lawmakers and high-level Moon administration officials in Seoul were busy with a seemingly outdated agenda: ratifying the 2018 Panmunjom Declaration Moon signed with North Korean leader Kim Jong Un.

The leaders of the two Koreas signed the agreement at their historic meeting in April 2018 at the truce village of Panmunjom at the inter-Korean border. The document promised to end the Korean War, work towards the denuclearization of the Korean Peninsula, and end all “hostile” activities against each other