Several ways to get that weapon without developing it. The billions in cash Obama/Biden gave them could be enough to have obtained one from Russia, China or on the black market.
And let's not forget that Pakistan has nuclear weapons and has a minority Shia Muslim population that might be exploited. Nuclear technology transfer from Pakistan to Iran already occurred by the creator of Pakistan's nuclear arsenal by Dr. Abdul Quadeer Khan, a Muslim.
No - even Russia and China aren't that reckless ... they aren't selling nukes to Iran. And, you can bet Pres. Trump would be highly ticked off if it ever did happen (and they know it).
Russia, Iran's big ally, quietly helps Iran's
reactor program, and may have given a few tips to Iranian scientists, but won't be directly involved in building a Bomb (from what we've seen so far)
Khan has sold the
centrifuge technology (that he stole while working in the Netherlands) to Pakistan and maybe others, although Pakistan and Iran are enemies.
And,
if Iran had the Bomb already, they would have used it against Israel by now ... so we have to assume they didn't have one yet.
