Turkey offers to mediate between US and Iran

The World
As Iran and the U.S. continue to square off over Iranian pursuit of nuclear power and more U.N. sanctions, Turkey has offered to try and be a mediator between the two countries. It's a complicated proposal; Turkey depends on its less-secular Middle Eastern counterpart for trade that could be threatened by sanctions. But it's also a potential win-win for all countries involved. Is Iran serious about wanting to work with the U.S.? Jonathan Marcus is the diplomatic correspondent for the BBC.
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