How policy has shifted back and forth since 1945 over the fine line between nuclear energy and nuclear weapons.
Iran's goal is to sow discord and inflict pain on energy markets, while avoiding crossing a threshold that prompts retaliation from the US. This is a fine line to walk at the best of times.
A fifth of the world's oil travels through the narrow waterway.
Iranian President Hassan Rouhani staked his political fortunes on bringing Iran out of isolation. Now, it appears he's losing control to hard-liners in Iran.
Iran has announced it will breach the limits on uranium enrichment agreed under the 2015 nuclear deal, after the US turned its back on the agreement. What does that mean for Iran's nuclear program?
The US has imposed new sanctions against Iran's top leaders, but its foreign policy has no clear focus.
A showdown with Iran over some oil tanker attacks in the Persian Gulf could push the US into its next Mideast war, writes a scholar of military aggression.
Both Iran and the US say they are not seeking a war, but it could happen by default.
Reformers have tried to modernise Iran for decades but have failed mainly due to the country's powerful theocracy. And then there are those who want to overthrow the regime altogether.
Iran has threatened to shut down this narrow seaway. Here's why that could be a big deal.
Recent protests in Tehran's Grand Bazaar are part of a long reform movement, not a new revolution.
Seven world leaders with axes to grind are preparing to sit round one table. Sparks will fly.
The recent parliamentary election in Iraqi may have been the most transformative of the post-Saddam era, a pollster from Baghdad and an American academic explain.
It would be a heavy lift, but revising the Iran nuclear deal would have some significant upsides, according to scholars at the University of Maryland.
The Iran nuclear deal will struggle to survive the damage done when Trump pulled the US out on May 8. So will US-Europe relations.
Just as Iran's centre ground was collapsing under political pressure, Donald Trump offered the hardliners a gift.
To understand how Syria has become the theatre for proxy wars between international forces, one has to return to the Arab uprisings and Syria's role as an outlier.
It largely depends on whether Europe will decide to ignore (and pay the price for) US sanctions.
Does the work of the international agency responsible for verifying whether Iran was in compliance with the deal matter to the US?
Ever since the shocking spectacle of the Iranian Revolution and hostage crisis, American conservatives have reserved a special disdain for the Islamic Republic.