The younger sister of North Korean leader Kim Jong Un could be as powerful as some of Kim's top aides, according to South Korean intelligence.

South Korean President Moon Jae-in said Wednesday negotiations between the United States and North Korea for a third summit have been ongoing behind the scenes.

South Korean officials expressed optimism that nuclear negotiations between the United States and North Korea may start again.

Kim Yo Jong told South Korean officials North Korea is interested in continued inter-Korea cooperation as she delivered a letter of condolence from North Korean leader Kim Jong Un at Panmunjom on Wednesday.

Kim Yo Jong made her first public appearance in more than 50 days at a gymnastics performance at Pyongyang's May Day Stadium.

South Korean business executives who had to abandon their assets at a factory park in North Korea are planning to visit the United States.

North Korean leader Kim Jong Un expressed his displeasure with facilities at a North Korean "youth palace" in the city of Kanggye.

Kim Jong Un was not on a list of delegates newly elected to Pyongyang's 14th Supreme People's Assembly on Tuesday.

North Korea claimed Kim Jong Un concluded a "productive visit" to Vietnam, following his return to Pyongyang early Tuesday.

North Korean leader Kim Jong Un answered a question from the White House press pool for the first time on Thursday.

North Korean performers who held concerts over the weekend in Beijing have returned to Pyongyang.

Kim Jong Un's summit with Chinese President Xi Jinping concluded in an hour on Tuesday.

Here is a summary of the major events that transformed North Korea's relations with the world in 2018.

Kim Jong Un provided no response to U.S. queries into the issue of Japanese abductees during his most recent meeting with U.S. Secretary of State Mike Pompeo.

U.S. Secretary of State Mike Pompeo said Monday the U.S. and North Korea made "significant progress" in the process of denuclearization.