As the conflict spreads to Yemen, Iraq and Egypt, complicating any diplomatic resolution, the region's energy sector and chokepoints face growing risks.

As the conflict spreads to Yemen, Iraq and Egypt, complicating any diplomatic resolution, the region's energy sector and chokepoints face growing risks.

The Middle East war is widening as Yemen’s Iran-backed Houthi rebels launch a spate of attacks on United States’ allies and close yet another key shipping waterway.