Item: Iran test fires ballistic missile. But don't worry:
[Foreign Minister Javad] Zarif said that his country's missiles are "not designed for the capability of carrying a nuclear warhead".
On a technical note, fitting a nuclear weapon a missile this size is not easy and is probably beyond Iran's current or very-near-future capabilities. But a) the best way to get get there is from here, b) ballistic missiles are by their nature offensive, not defensive weapons, c) what are the odds that Iran wants to be the first country in the world to design medium-range ballistic missiles to deliver conventional, rather than nuclear, warheads?
If you want to know a nation's intent when it comes to nukes, watch what they do with delivery systems.