DUBAI (Reuters) - Iran appeared to take a harder line in its nuclear dispute with world powers on Sunday by dismissing as "ridiculous" one idea that could allay Western concerns about a planned atomic research reactor.
The fate of the heavy-water reactor at Arak, which has not yet been completed, is one of several thorny issues in talks between Iran and six powers aimed at reaching a long-term deal on Tehran's nuclear programme by an agreed July 20 deadline.
