Moon returned home late Sunday following his trip to the US for his first summit talks with the new US leader.

In a joint statement issued after their summit, Trump stated his support for South Korea's leading role in ridding North Korea of its nuclear weapons, as well as Seoul's ongoing efforts to resume dialogue with Pyongyang to discuss humanitarian issues.

"We had greater success than we expected in meeting with President Trump last week that included an agreement to further strengthen the Korea-US alliance," Moon told Obama.

Obama was on a trip here to speak at a leadership forum organized and hosted by a local daily newspaper.

The former US leader expressed support for Moon and his new administration, noting nothing was impossible with the support of the people and that President Moon had the support of the people in both South Korea and the US, Moon's chief press secretary Yoon Young-chan told a press briefing.

Also, the Korea-US alliance currently has the bipartisan support of the US' ruling and opposition parties, he added, according to Yoon. (Yonhap)