The entry of Yemen's Houthi rebels into the war on the side of Iran has stoked fears that the oil crisis affecting global trade could get worse. Threats of Iranian mines and missiles have kept the crucial Strait of Hormuz largely closed, with oil tankers held up leaving the Gulf and sending the price of a barrel skyrocketing. Saudi Arabia , one of the biggest exporters of oil in the world, has instead been sending millions of barrels of crude oil a day through Bab el Mandeb, another narrow