Hopes rise for accord in nuclear negotiation

Direct contact between Teheran and world leaders cited as positive force

Hopes have risen of a breakthrough preliminary deal in talks on Iran's nuclear program, observers said, as the second round of negotiations within a month between Iran and the world's major powers began on Wednesday.

While experts said every side has practical demands for the settlement of the Iranian nuclear issue, they warned that the talks might stumble if not enough flexibility is shown during negotiations.