You are probably familiar with the advice given to President Obama from U.S. leaders, critics, pundits and even comics, but are you familiar with the advice he has received from other world leaders? The magazine Foreign Policy recently invited an assortment of international leaders to offer their advice to the new president. Some of the advice underscores the hope and optimism that has greeted the inauguration of our new president, while other, more pointed advice, underscores the difficult foreign policy challenges he is facing.