Both moves ought to signal advances in the global effort to stop the bomb's spread.

In the aspect of laser guide, when it is low visibility, the light scattering by fogs must affect laser-guided-bomb's work, such as the precision of guide decreases or cannot hit the target.

If its domestic stockpile could in this way be kept below a bomb's worth, this would also ease pressure in Israel for a military strike on Iran's nuclear facilities and so buy yet more time for talks.