Saudi Arabia has many of the same problems that the US has. They have the money to try and influence its enemies with military force, yet they haven’t been successful.
Most westerners don’t realize that Saudi Arabia has enemies along its borders and that they’ve been subject to invasions in recent years. They’ve built a “wall” on the border with Iraq. They’ve funded and coerced the US to topple Syria’s leader. They invaded Yemen and are still fighting there. Despite having a huge technological and military equipment advantage they aren’t winning.
They are actually hiring soldiers from foreign countries to serve in their military in Yemen. Read more here.