For Obama, Tough Decisions From the Start.

The question for some analysts: Will the IAEA conclude that Tehran has accumulated enough low-enriched uranium to allow a quick conversion into the highly-enriched uranium needed for a weapon?

"It's not what I would describe as a tripwire, but it's a psychological milestone that I think could put pressure on the administration to respond in some way," says Jon Wolfsthal of the Center for Strategic and International Studies. Wolfsthal is a proliferation expert who previously served as the American on-site monitor at North Korea's nuclear complex at Yongbyon.

Read the article