ROUGH CUT (NO REPORTER NARRATION)<br/> <br />U.S. Secretary of State John Kerry on Sunday (November 23) joined talks with foreign ministers from the six powers negotiating with Tehran on its nuclear program.<br/> <br />Iran and the powers - the United States, France, Germany, Britain, Russia and China - aim to reach a long-term deal to end the decade-old nuclear standoff by a self-imposed Monday (November 24) deadline. Many diplomats and analysts believe an extension may be needed in view of the wide gaps in negotiating positions.<br/> <br />Iranian Students News Agency (ISNA) reported on Sunday that Iranian officials believe it will not be possible to reach a comprehensive deal with world powers in the time remaining.<br/> <br />The six world powers are looking to clinch a pact under which Tehran would curb its nuclear work in exchange for lifting economically crippling sanctions. Iran rejects Western allegations that it has been seeking to develop a nuclear bomb capability.<br/> <br />Diplomats said a framew
