If because of the fear of other countries, new countries are getting nuclear.
According to me, that is wrong. But however, its difficult to give a concrete answer.
To bring peace to the world, someone would have to take the initiative.
I dont think Iran should become nuclear because surrounding have strong nuclear powers.
Someone would have to take a hard step towards non-nuclear weapon by not being nuclear no matter other possesses that power or not.
That is the teachings of Gandhiji: non-violence.
Sooner or later, that may tempt other nations to get deprived of their nuclear weapons bringing peace to the world.
This is the only way to do so.