World powers will insist on Iran curbing its production of high-grade uranium at the next round of nuclear talks in Moscow, a senior European Union negotiator told her counterpart in Tehran on Thursday, June 7, Reuters reported. In a letter to Tehran, the European Union’s Helga Schmid said an offer by the six powers trying to resolve a standoff with Iran over its nuclear work, proposed at talks in Baghdad in May, was still on the table. The six countries – the United States, China, Russia, Germany, France and Britain – have asked Tehran to stop enriching uranium to 20 percent, a major step en route to building nuclear weapons. “Unfortunately, in Baghdad Iran was not prepared to take up our suggestion to enter into discussions on the substance of the proposal,” Schmid wrote.