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 The U.N. nuclear watchdog has withdrawn its inspectors and nuclear experts believe Iran relocated more than 400 kilograms of highly enriched uranium—enough for 10 nuclear weapons—to a secret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.

The United States and Iran are poised to return to the negotiating table at a moment when tensions between the two are high and trust is low.

Iran says it has not requested talks with the United States over its nuclear programme, as claimed by US President Donald Trump. “No request for a meeting has been made on our side to the American side,