TOKYO/SEOUL -- U.S. and North Korean government officials are working toward the summit between Donald Trump and Kim Jong Un in Singapore on June 12. But what kind of results the historic summit might yield remain uncertain since the U.S. and North Korea have different ideas regarding how and when North Korea will give up its nuclear weapons. Washington has spoken of a unilateral disarmament, while Pyongyang has talked about denuclearizing little by little as the U.S. makes economic concessions.
Five things to know about US-North Korea summit
What kind of outcome would be considered a success?