After squinting through binoculars into a nation frozen in time, US President Barack Obama reeled off a contempt-laden and startlingly frank indictment of North Korea. The Stalinist remnant of the Cold War was, in Obama's eyes, nothing but a nation which cannot make "anything of any use", "doesn't work", and even its vaunted weapons exports were hardly state of the art. "It is like you are in a time warp," Obama said Sunday, after he toured a rocky border post in the demilitarised buffer zone that has split the Korean peninsular for longer than he has been alive. "It is...