U.S. President Donald Trump has told his South Korean counterpart Moon Jae-in that it was good news for the world that the leaders of the two Koreas reaffirmed the goal of complete denuclearisation during their summit on Friday, Moon's office said on Sunday.

During a phone call late Saturday, Moon and Trump agreed on the need for an early summit between Trump and North Korean leader Kim Jong Un, which Trump said would take place over the next three to four weeks.

Moon and Trump also exchanged views on two to three possible locations for the Kim-Trump summit, Moon's office said.