That is false. Iran is trying to acquire nuclear weapons or probably already has a steady artillery. Plus why would they fear invasion from the US? the Americans have nothing to invade Iran for but if they "Invade" Iran would probably be because of terrorism concerns. and not mention the UN...
the US have been threatening and hating on the Iranians for 32 years, since the Iranian people ousted the US Shah puppet regime in 79
the US have had extreme economic sanctions on Iran for years and in fact increased them recently, this has always been an historical precursor to war
The same thing happened to the Iraqi's before we invaded them in 03
If I was Iran I would be freaking out right now
I not denying Iran wants or has a nuclear weapon I'm trying to get you understand why they want one, Iran probs hopefully wants to create a cold war situation with the US, so they don't automatically come in and annihilate their country like they did to iraq whenever they want
also the US already tried to destroy Iran by sponsoring and funding an Iraqi invasion of Iran, during Iran Iraq war from 1980 to 88 that led to the death of around a million Iranians