According to @TheGoodISIS, Iran’s nuclear weapon program included putting a nuclear bomb on a Shahab-3 missile. This type of missile now has a range of 2000 km, due to the use of Multiple Reentry Ballistic Missile technology.
And as I stated previously, Iran probably has working nuclear bombs already. This is the likely explanation for their sudden increase in aggressive behavior that began May 7 of 2019. Look for an announcement from Iran on their nuclear program soon, perhaps in May of 2020.