As sanctions take hold, Iranians are more dissatisfied with their government than ever. The time is right for the US and other democracies to actively support freedom seeking Iranians and regime change. That would also solve the crisis over Iran's nuclear program.
Iran recently announced plans to develop nuclear-powered submarines, requiring enough highly enriched uranium for two nuclear weapons. Tehran's ambition seems to be more than just a bargaining chip. Upping the ante on its questionable nuclear program is dangerous and needless.