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 French Foreign Minister Laurent Fabius, US Secretary of State John Kerry, former EU foreign policy chief Catherine Ashton, the High Representative of the Union for Foreign Affairs, Britain's Foreign Secretary Philip Hammond and German Foreign Minister Frank-Walter Steinmeier meet for dinner at the residence of British ambassador in Vienna on November 23, 2014. At stake in the Austrian capital Vienna is a historic deal in which Iran would curb its nuclear activities in exchange for broad relief from years of heavy international economic sanctions. It could end a 12-year standoff with the West that has even raised the threat of Israeli military strikes against Iranian nuclear facilities. AFP PHOTO / POOL / JOE KLAMARJOE KLAMAR/AFP/Getty Images
 French Foreign Minister Laurent Fabius, US Secretary of State John Kerry, former EU foreign policy chief Catherine Ashton, the High Representative of the Union for Foreign Affairs, Britain's Foreign Secretary Philip Hammond and German Foreign Minister Frank-Walter Steinmeier meet for dinner at the residence of British ambassador in Vienna on November 23, 2014. At stake in the Austrian capital Vienna is a historic deal in which Iran would curb its nuclear activities in exchange for broad relief from years of heavy international economic sanctions. It could end a 12-year standoff with the West that has even raised the threat of Israeli military strikes against Iranian nuclear facilities. AFP PHOTO / POOL / JOE KLAMARJOE KLAMAR/AFP/Getty Images

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As a March 31 deadline draws near, negotiators are honed in on two major issues. Jeremy Diamond explains.

What to know about the U.S.-Iran nuclear negotations

As a March 31 deadline draws near, negotiators are honed in on two major issues. Jeremy Diamond explains.