The White House says the release of three Americans detained in North Korea will be one of the key agendas for the upcoming U.S.-North Korea summit.<br /> Senior Director for Asian Affairs at the National Security Council, Matthew Pottinger,... made the comments to reporters on Tuesday. <br />The American detainees are Kim Sang-duk also known as Tony Kim, Kim Hak-song and Kim Dong-chul .<br />They are being held on charges of espionage and other undisclosed crimes. <br />
