U.S. and North Korean officials are to start fine-tuning a joint statement as well as discussing security and protocol for a second summit, the National Intelligence Service here told lawmakers Tuesday.

NIS chief Suh Hoon and other officials told the National Assembly's Intelligence Committee that both the U.S. and the North are "very satisfied" with a recent meeting between U.S. President Donald Trump and North Korean leader Kim Jong-un's right-hand man, Kim Yong-chol, in Washington. Kim Yong-chol and Trump had in-depth discussions in a "friendly atmosphere," they added.

"North Korea's denuclearization will gain momentum as working-level talks are now at full throttle," said a lawmaker on the committee. But the venue is still undecided.

