FILE - In this Tuesday, June 21, 2011 file photo, Fereidoun Abbasi Davani, Iranian Vice President and Head of the Atomic Energy Organization, waits at a press briefing at the Ministerial Conference on Nuclear Safety at the International Atomic Energy Agency, IAEA, in Vienna, Austria. Iran's nuclear chief signaled Tehran's envoys may bring a compromise offer to the talks this week with world powers: Promising to eventually stop producing its most highly enriched uranium, while not totally abandoning its ability to make nuclear fuel.(AP Photo/Ronald Zak, File)

Associated Press
FILE - In this Tuesday, June 21, 2011 file photo, Fereidoun Abbasi Davani, Iranian Vice President and Head of the Atomic Energy Organization, waits at a press briefing at the Ministerial Conference on Nuclear Safety at the International Atomic Energy Agency, IAEA, in Vienna, Austria. Iran's nuclear chief signaled Tehran's envoys may bring a compromise offer to the talks this week with world powers: Promising to eventually stop producing its most highly enriched uranium, while not totally abandoning its ability to make nuclear fuel.(AP Photo/Ronald Zak, File)
FILE - In this Tuesday, June 21, 2011 file photo, Fereidoun Abbasi Davani, Iranian Vice President and Head of the Atomic Energy Organization, waits at a press briefing at the Ministerial Conference on Nuclear Safety at the International Atomic Energy Agency, IAEA, in Vienna, Austria. Iran's nuclear chief signaled Tehran's envoys may bring a compromise offer to the talks this week with world powers: Promising to eventually stop producing its most highly enriched uranium, while not totally abandoning its ability to make nuclear fuel.(AP Photo/Ronald Zak, File)
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