No sooner had Yemeni President Abd-Rabbu Mansour Hadi announced his resignation than his country’s tenuous political fabric began to disintegrate.     Provinces across a nation barely held together by a complex web of tribal and religious alliances said they would no longer take military commands from Sanaa after the Iranian-allied Shi’ite Houthi group besieged Hadi’s home and palace this week. The emerging fragmentation of the Arabian Peninsula country has sparked fears of the “Somalization” of a state which is home to a revitalized al Qaeda insurgency as well as a neighbor to top oil exporter Saudi Arabia.     For Washington, Yemen’s splintering would make it hard to carry out a counter-terrorism strategy against al Qaeda plotters who have targeted it and its ally Saudi Arabia and claimed responsibility for the Jan. 7 Charlie Hebdo attacks in Paris. Through Hadi, a supporter of U.S. drone […]