Iran wants to put itself in a position such that if an international crisis arises and there is an external threat to the national security of Iran, Iran can be in a position to make a nuclear weapon in an emergency as a deterrent against a foreign threat. Otherwise, Iran has no intention whatsoever of making a nuclear weapon, because Iranian leaders are fully aware that if they cross the line and somehow they make nuclear weapon, that will start a very bad nuclear arms race in the Middle East, which will ultimately will not be in Iran's benefit or in any body's benefit in that region.