Why Did Saudi Air Defense Fail?

Billions of dollars spent on weapons for what? Why did Saudi defense fail?

"Riyadh was too complacent; apparently it was assumed that the Houthis could not attack Saudi Arabia in this way.

Saudi Arabia has become extremely vulnerable to attack despite its huge spending on advanced weaponry

In terms of image and credibility, it could not be worse than this time; This attack precisely undermines the image of a "stable and modern Arabia".

Video/hunting of Saudi mercenaries by the Yemeni armed forces

The sound of 3 explosions after a drone attack on the Saudi capital

Yediot Aharanot: Yemenis humiliated the Saudis

Pakistan, Turkey and Egypt's reaction to Yemen's Ansarullah attacks on Saudi Arabia

Yemen's statement about conducting 4 special operations deep in Saudi Arabia

Yemen: We will not give Saudi Arabia a chance

The latest developments in the war in Yemen, the advance of Ansarullah fighters continues/Yahya Saree's warning; Stay away from oil facilities/Yemen targeted Riyadh and Najran airports and Khamis Mushit base.