Houthi strike a clear escalation in the Middle East

A view it's become clear both Saudi Arabia and the Houthis have been gearing up for another offensive. 

The Houthi group in Yemen have taken responsibility for targeted attacks, including yesterday's deadly strike on Riyadh Airport that killed 13.

Hundred of flights have been cancelled after a further attack caused a fire in the terminal's passenger hall. 

The Economist's Middle East correspondent Gregg Carlstrom told Mike Hosking they've been fighting for the better part of 10 years. 

He says the cost of the continuing battle against the Houthis will come at a big cost to Saudi Arabia. 

LISTEN ABOVE