For the first time since the Singapore summit, a shadow of doubt has been cast over the Korean peace process. Its source is the United States’ unyielding demand for complete North Korean nuclear disarmament before ending the Korean War and prior to allowing the...

It didn’t take much for the leaders of the two Koreas to put an end to the decades-long culture of crisis pervading the Korean Peninsula. With a phone call, a quick drive to the North Korean side of the Demilitarized Zone, and a public embrace, South Korean President...