[caption id="attachment_152516" align="alignright" width="178"] US negotiating team holds meeting after negotiating with Iranian counterparts on Feb 22, 2015.[/caption]

Western diplomats say Iran surprised world powers with a proposal offering, for the first time, concessions vis-à-vis the Islamic Republic's centrifuge array and their enriched uranium stockpile.

An Iranian proposal to close down a third of its centrifuges and relinquish most of its low-enriched uranium has led to progress in talks with the six world powers in Geneva, according to Western diplomats. However, many issues remain unresolved and the chances of reaching an agreement on Iran’s nuclear program by March 30 are low, they add.

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