A proposal on how to resolve the stand-off over Iran’s nuclear programme looks like it could potentially break the deadlock over the thorny issue. The European Union’s foreign policy chief Javier Solana was in Tehran to present the package and said the response was positive.The plan was drawn up and agreed on by the US, Russia, China, Britain, France and Germany. Iran’s chief nuclear negotiator described it as holding positive steps but also ambiguities that had to be removed. Ali Larijani did not say however what those ambiguities were but added that the proposal would be studied in detail and followed by another round of talks.Little is known about the package which incorporates incentives and penalties. It is thought to offer nuclear technology and security guarantees but also an arms embargo if Tehran does not comply. The United States has been at the forefront of efforts to pressure Iran to give up uranium enrichment amid fears the Islamic Republic will build a nuclear bomb. Iran insists its programme is peaceful, its sovereign right and also necessary to generate electricity.