SEOUL, May 25 (Xinhua) -- South Korean President Moon Jae-in expressed deep regret over the cancelled summit between the Democratic People's Republic of Korea (DPRK) and the United States, the Blue House of South Korea said early on Friday.

"It is embarrassing and very regrettable for the scheduled North Korea (DPRK)-U.S. summit not to be held on June 12," Moon said at the urgent meeting of the National Security Council (NSC).

Moon convened the meeting for an hour from midnight, right after U.S. President Donald Trump cancelled the first-ever summit between the Democratic People's Republic of Korea (DPRK) and the United States originally scheduled for June 12 in Singapore.