VIENNA - Six world powers and Iran strived at a second day of talks in Vienna on Wednesday to map out a broad agenda for reaching an ambitious final settlement to the decade-old standoff over Tehran's nuclear program.

The United States, Russia, China, Britain, France and Germany want a long-term agreement on the permissible scope of Iran's nuclear activities to lay to rest concerns that they could be put to developing atomic bombs. Tehran's priority is a complete removal of damaging economic sanctions against it.

The negotiations will probably extend at least over several months, and could help defuse years of hostility between energy-exporting Iran and the West, ease the danger of a new war in the Middle East, transform the regional power balance and open up major business opportunities for Western firms.

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