Hours after arriving in Seoul for his third visit as president, Barack Obama -- behind a thick plate of bulletproof glass, wearing an Air Force One leather jacket that looked pretty bulletproof itself -- stood on the demilitarized zone peering through binoculars into the haze of North Korea, a ritual performed by George W. Bush ten years ago and Bill Clinton a decade before that. Perhaps standing so close to North Korea inspired Obama to address Pyongyang directly for the first time since taking office. In the middle of a speech to South Korean students at Hankuk University of Foreign Studies the following day, Obama abruptly looked into the cameras and said: "I want to speak directly to the leaders in Pyongyang. The United States has no hostile intent toward your country. We are committed to peace. And we are prepared to take steps to improve relations, which is why we have offered nutritional aid to North Korean mothers and children."