Riyadh's nightmare is Tehran laying its dirty paws upon the Bab el Mandeb, the narrow pirate-infested strait where the oil tankers from the Gulf to the West are passing. Simply said, Saudi Arabia has been in a cold(ish) war with Iran for a while. And now, Yemen has become the next hot battlefield in that war. The bloody standoff between Sunni and Shia that we've been seeing in places like Syria, Iraq and Lebanon, has opened a new front.
The Saudis and their Arab coalition are bombing positions of the Shia Houthi rebels as we speak. The Houthis had taken Yemen's main towns, and forced president Hadi to flee for his life. They're supported by Iran. For quite a while, actually. And that's no secret to anyone.
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