Houthi rebels have been attacking ships in the Red Sea for months. Now the U.S. and its allies have given the Yemeni militant group a final warning to stop the attacks. WSJ's Nancy A. Youssef explains what's motivating the Houthis and what the attacks mean for a region already on edge.

Further Reading:

-U.S., U.K. Warships Shoot Down Houthi Barrage in Red Sea 

-Importers Face Surging Shipping Costs, Delays as Red Sea Diversions Pile Up 

-U.S., Allies Give Houthis Ultimatum: Stop Ship Attacks or Face Consequences 

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