US President Obama has described latest international nuclear talks on Iran's nuclear programme as constructive. However, he said, he now wants to see concrete action from Iran to prove its intentions are peaceful.<br/> <br/>Negotiations between Iran, the US and other powers took place in Geneva. Speaking in Washington later, President Obama said, he wants Iran to give access to the newly-revealed nuclear plant in Iran in two weeks.<br/> <br/>He also called for rapid progress on the deal. West believes substantial amounts of Iran's enriched uranium will be taken out of the country and further processed in a way that would be prevented from using it for nuclear bombs. <br/><br/>