We did none these things. They did. Who are they? The wielders of power and the interests for whom they front.
The best way to keep Iran from building a nuclear bomb is for the Obama administration and its nuclear client Israel to stop threatening the Islamic Republic.
Look at recent history. In 2003 Iraq’s government had no nuclear weapons (or other WMD). The U.S. government invaded, and before long Iraqi President Saddam Hussein was hanging from a rope. In 2011 Libya’s government had no nuclear weapons. The U.S. government led NATO on a bombing campaign to help a group of rebels, and before long Libyan Col. Muammar Qaddafi lay dead on a roadside. Today Syria has no nuclear weapons. The U.S. government and NATO are currently aiding rebels seeking to overthrow (and likely kill) President Bashar al-Assad.
On the other hand, North Korea has nuclear weapons, and Supreme Leader Kim Jong-un appears safe from any regime change sponsored by the U.S. government and NATO.
Lesson for foreign leaders who are in the doghouse with the U.S. government: Get a nuke.