In recent weeks, the Saudi-Emirati rivalry has literally exploded into the open. It happened in Yemen, where Saudi airstrikes targeted arms shipments bound for the Emirati-backed Southern Transitional Council (STC) in late December. Riyadh then leaned heavily on Abu Dhabi, which belatedly gave up its ally when the STC agreed to dissolve. The stark contrast with 2015—when Saudi Arabia and the United Arab Emirates launched a joint intervention in Yemen to curb Houthi influence there—was obvious