Why can’t Saudi Arabia stop the Houthi attacks?

Despite spending hundreds of billions of dollars assembling one of the Middle East’s most powerful militaries, Saudi Arabia has struggled to stop a wave of Houthi attacks. Day after day this month, strikes have hit targets deep inside the kingdom, including Riyadh’s King Khalid International Airport, exposing the limits of that vast investment in stark fashion.Why are the Houthis proving so successful? Analysts say the Houthis have used a four-year ceasefire with Riyadh to rearm and