Iran's nuclear program may get more difficult to monitor if no deal is reached with the United States. The U.N. nuclear watchdog has withdrawn its inspectors and nuclear experts believe Iran relocated more than 400 kilograms of highly enriched uranium—enough for 10 nuclear weapons—to a secret location.

Iran remains 'obsessed' with building nuclear deterrent despite damage incurred from U.S. strikes last month, but suggests its still open to negotiation in a move that one expert warns is a ploy to buy time.

A senior Israeli official says Israel believes deeply buried stocks of enriched uranium at one Iranian nuclear facility hit by the U.S. military are potentially retrievable