Task: Sentence Expansion
Input (English): In April 2018 , Jong-un and Moon Jae-in formally attended the inter-Korean summit of 2018 and agreed to formally end the Korean War before 2019 .
Output (English): At the April 2018 inter-Korean summit , Kim and South Korean President Moon Jae-in signed the Panmunjom Declaration , pledging to convert the Korean Armistice Agreement into a full peace treaty , formally ending the Korean War , by the end of the year .