In this Nov. 10, 2013, photo, U.S. Secretary of State John Kerry steps aboard his aircraft in Geneva, Switzerland. Nuclear talks with Iran have failed to reach agreement, but Kerry said differences between Tehran and six world powers made "significant progress." For President Barack Obama, the Iranian nuclear deal he covets now depends in part on his ability to keep a lid on hard-liners on Capitol Hill and an array of anxious allies abroad, including Israel, the Persian Gulf states, and even France. (AP Photo/Jason Reed, Pool)