Iran and six nations outlined a possible permanent accord Thursday that would impose long-term limits on the Islamic republic's nuclear program in exchange for the lifting of nearly all Western and U.N. sanctions. Under the framework, the United States and European Union would begin rolling back all nuclear-related economic and trade sanctions once inspectors verify that Iran has met all of its key nuclear commitments, including the dismantlement of most of its 19,000 centrifuges and the forfeiture of most of its stock of enriched uranium. American restrictions imposed against Iran for terrorism, human rights violations and missile development would remain...