The American president took his case straight to the people on his trip this week, spending limited time with the leaders of Saudi Arabia, Egypt, Germany, and France.
The president didn't announce any policy changes but sought to challenge his listeners' preconceptions about the Israeli-Palestinian conflict.
The May 25 test provided the world with a host of data about North Korea's bomb-making abilities. But only Pyongyang knows if the test was a success.
Q&A: Kim Jong Il's drive to make his nation a nuclear power and how that threatens Asian neighbors.