Over the past few months, the Red Sea has shifted from a highly trafficked maritime passage to something more like a battleground. Attacks on cargo vessels by Houthi rebels have threatened both regional stability and the arteries of global commerce.
On March 2, the Rubymar finally sank. The cargo ship had been targeted by Houthi militants on Feb. 18 and had been taking on water in the days since. It’s the first vessel lost to the Houthi attacks in and around the Red Sea, which began in November...