The war in Yemen is been raging for more than four years, but with journalists struggling to access the country it has rarely topped the news agenda.

Until last week, when attacks on oil depots in neighbouring Saudi Arabia linked to Yemeni rebels, caused the biggest spike in global oil prices in three decades.

That's also resulted in further tension between the US and Iran, and turned the spotlight onto the massive food crisis on-going in Yemen.

Yemeni rebels, oil prices, the US, Iran, Saudi Arabia, widespread hunger. It may seem disconnected and confusing, but in this week's Explained by Prime Time, Mark Coughlan and Dimitri O'Donnell talk you through how they're all linked, and outline why two of the world's major powers now say they're prepared to go to war.