Iranian President Mahmoud Ahmadinejad has tasked the country's atomic chief with enriching uranium to 20 percent. Speaking at the exhibition of Laser Science and Technology Achievements in Tehran, Mr. Ahmadinejad called on country's atomic chief Ali Akbar Salehi, to start the process. He however said that that Iran is ready to negotiate on the issue. The development comes as Iranian Foreign Minister Manouchehr Mottaki recently expressed hope that an agreement on the nuclear fuel proposal will soon be reached with the Western side, but with the changes that Tehran seeks. But European and US officials said that Iran must prove to the rest of the world that its nuclear programme is purely for peaceful purposes, even if it agrees to a nuclear-fuel swap.