Citing a "senior" American official, CNN reported Wednesday Obama's letter to Kim was delivered by Stephen Bosworth, U.S. special envoy for North Korea, last week during a three-day visit to North Korea.
The U.S. broadcaster noted Bosworth said after the trip he had "communicated President Obama's view that complete denuclearization of the Korean Peninsula is a fundamental undertaking of the six-party process ... and that the absence of progress on denuclearization is an obstacle to improving our relations."
He added at the time that Obama "has made it clear, the United States is prepared to work with allies (and) partners in the region to offer ... North Korea a different future."
CNN reported Bosworth also said the United States was reaffirming its desire to "fully implement" a 2005 joint statement issued by the nations involved in six-party North Korean denuclearization talks declaring that Pyongyang had "committed to abandoning all nuclear weapons and existing nuclear programs."
Jordana Brewster on Paul Walker: 'He was an enormous presence in my life'
Kate Middleton recycles dress at movie premiere