Britain and the US have raised fears that Russia has shared nuclear secrets with Iran in return for Tehran supplying Moscow with ballistic missiles. According to The Guardian, the US and the UK are concerned about what Russia may provide in return for the ballistic missiles. The Guardian quoted British sources as saying that the two countries believe Iran may be working with experienced Russian specialists. Iran may be working to streamline its manufacturing process as it grows its stockpile of enriched uranium to acquire its own nuclear weapons, the report said.