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Germany, the U.S. and four other powers have spent years addressing concerns over Iran's nuclear ambitions. However, two days of tough talks ending Monday failed to make major headway toward a final deal.
Foreign Minister Frank-Walter Steinmeier said Tuesday that flexibility and "strength of leadership" on all sides are needed to seal a compromise.
Steinmeier says he is "convinced that the situation won't come around again so soon." He says he fears that simply extending negotiations "won't bring the solution - not in the next two years.
By The Associated Press
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