When the United States walked away from the Iran nuclear deal just over a year ago, the waiting game began.

On Monday, Tehran announced it had amassed a stockpile of low-enriched uranium above the threshold allowed in the defunct deal - a move Donald Trump called "playing with fire".

An escalating series of incidents - oil tankers holed with missiles; the shooting down of a US "spy" drone; an American cyber attack on an Iranian intelligence group - have watchers on high alert.

This week, should we be bracing for an invitation to another Coalition of the Willing?

Host:

Tory Maguire, National Editor, The Sydney Morning Herald and The Age.

Guests:

Peter Hartcher, International and Political Editor, The Sydney Morning Herald.

David Crowe, chief political correspondent for the Sydney Morning Herald and The Age.

Matthew Knott, reporter for The Sydney Morning Herald and The Age based in the United States.

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How are we doing? Get in touch with the team: pleaseexplain@theage.com.au or pleaseexplain@smh.com.au