U.S. Under Secretary for Political Affairs Wendy Sherman, left, and Political Director of the Ministry of Foreign Affairs of the United Kingdom Simon Gass, right, listen during talks on Iran's nuclear program in Almaty, Kazakhstan Wednesday, Feb. 27, 2013. World powers hope Iran will respond positively on Wednesday to their new offer to lift some sanctions if Tehran scales back nuclear activity the West fears could be used to build bombs. (AP Photo/Ilyas Omarov, Pool)

Associated Press
U.S. Under Secretary for Political Affairs Wendy Sherman, left, and Political Director of the Ministry of Foreign Affairs of the United Kingdom Simon Gass, right, listen during talks on Iran's nuclear program in Almaty, Kazakhstan Wednesday, Feb. 27, 2013.   World powers hope Iran will respond positively on Wednesday to their new offer to lift some sanctions if Tehran scales back nuclear activity the West fears could be used to build bombs. (AP Photo/Ilyas Omarov, Pool)
U.S. Under Secretary for Political Affairs Wendy Sherman, left, and Political Director of the Ministry of Foreign Affairs of the United Kingdom Simon Gass, right, listen during talks on Iran's nuclear program in Almaty, Kazakhstan Wednesday, Feb. 27, 2013. World powers hope Iran will respond positively on Wednesday to their new offer to lift some sanctions if Tehran scales back nuclear activity the West fears could be used to build bombs. (AP Photo/Ilyas Omarov, Pool)
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