Kerry, Zarif Meet as Tuesday's Iran Nuclear Deadline Approaches

The top U.S. and Iranian diplomats met for a sixth consecutive day on Sunday to try to resolve obstacles to a nuclear accord, including when Iran would get sanctions relief and what advanced research and development it may pursue. Secretary of State John Kerry and Iranian Foreign Minister Mohammad Javad Zarif are trying to meet a Tuesday deadline for a final deal under which Iran would curb its atomic work for more than a decade, in exchange for sanctions relief. They have made some progress on the type of bilateral sanctions relief that Iran may receive, but the two sides remain divided on such issues as lifting United Nations sanctions.... and on research and development using advanced centrifuges.