President Barack Obama inherited perhaps the most daunting and intractable tangle of foreign policy challenges of any American leader since Harry Truman had to reformulate American foreign policy to face the Cold War. From Afghanistan to Yemen, from North Korea’s new nuclear capability and Iran’s aspirations, stalled peace talks in the Middle East to a global financial crisis blamed on the United States, Obama’s challenge now is to design strategies that fulfill the lofty goals he set out in his campaign and his first year in office. David E. Sanger, chief Washington correspondent for The New York Times, discussed his assessments of President Obama’s year, and the year ahead, with an insider’s view of the Obama national security team.