A top Iranian nuclear negotiator is minimizing prospects for a breakthrough in talks between Tehran and the P5+1 aimed at decreasing opacity around Iran’s atomic program. Mostafa Dolatyar, who heads the Iranian foreign ministry’s think tank, blasted the approach of the P5+1 – the United States, Britain, France, Germany, Russia, and China – as “purely political.” His statement comes in the aftermath of leaks yesterday suggesting that the P5+1 was preparing an upgraded offer for Iran, which some analysts had taken as evidence of progress in the talks.