President Moon Jae-in, right, and U.S. President Donald Trump smile during their meeting at the tea house on the grounds of the Blue House in Seoul, South Korea, Saturday. AP

President Moon Jae-in talks with U.S. President Donald Trump and other guests during their meeting at the tea house on the grounds of the Blue House in Seoul, South Korea, Saturday. AP

U.S. President Donald Trump began a dinner meeting with President Moon Jae-in at Cheong Wa Dae on Saturday, soon after arriving in South Korea from Japan, where he attended a Group of 20 summit.

He landed at Osan Air Base in Gyeonggi Province on Air Force One and was greeted by South Korean and U.S. officials including Washington's top envoy in Seoul, Harry Harris.

Trump then boarded the Marine One chopper bound for the U.S. military base in Yongsan in central Seoul. He used a car to reach Cheong Wa Dae.

He took a walk with Moon and chatted over cocktails for several minutes before dining together at the Sangchunjae pavilion, a beautiful structure modeled after a traditional Korean house, or hanok.

The official welcoming dinner came in advance of their formal summit talks the following day, with Trump also scheduled to visit the Demilitarized Zone (DMZ), which serves as the inter-Korean border. He hopes for a meeting with North Korean leader Kim Jong-un there but it's unclear whether Kim will show up.