What are the possible benefits and challenges of US-Iran nuclear talks for the region and the world?
(Refiles to fix hyperlinks) By Tuvan Gumrukcu DUBAI, Feb 4 - The U.S. and Iran are due to hold talks in Oman on Friday after Tehran requested a change of venue to limit negotiations to its nuclear programme, a regional official said, with a build-up of U.S. forces in the Middle East raising fears of a confrontation