South Korean President Moon Jae-in urged the United States and North Korea to each cede some ground in an attempt to broker talks between the two countries centered around resolving the nuclear crisis as Pyongyang reiterated its openness to dialogue and Washington said it was taking a wait-and-see approach.

"The United States needs to lower its bar for dialogue and the North, too, must show its willingness to denuclearize," Moon was quoted as saying by the presidential Blue House.

"It's important the United States and North Korea sit down together quickly," Moon said.