Iran has proposed a modification to the terms of its UN-brokered nuclear fuel deal. Tehran insists it is ready to exchange its low-level enriched uranium for higher enriched material, but only if the exchange is immediate, and takes place inside Iran.The breaking of past promises is blamed for the new conditions: “Countries with whom we are talking don’t have a good record in the public mind. The French, British, Canadians and Germans have had longstanding commitments with Iran, but despite these signed agreements they did not keep their promises, and this created mistrust. To avoid this again we are seeking 100 percent guarantees, and one guarantee that can be given could be fuel exchange within Iran,” said foreign ministry spokesman Ramin Mehmanparast. As Iran negotiates the fuel issue it is also preparing for the worst, with large scale air defence exercises currently underway around the country. Israel has not ruled out attacking Iran’s nuclear sites from the air if it develops nuclear weapons.