How are Yemen’s Houthis attacking Saudi Arabia so effectively?

How are Yemen’s Houthis attacking Saudi Arabia so effectively? ReutersWhy Does Saudi Arabia Struggle to Stop Houthi Attacks? The New York TimesTwo scenarios for the Yemen war Al JazeeraIran-Backed Militants Are Tightening the Screws on Saudi Arabia’s Crown Prince WSJWhy billions spent on defense haven’t shielded Saudi Arabia from Houthi attacks CNN

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