” .... shift the balance of power ..... “
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The Saudis shouldn’t be trying to shift the balance of power. Assad has been in power for a very long time. It’s not their business.
Besides, I don’t recall any of the 911 terrorists being from Syria. 15 of the 19 were from Saudi Arabia. Maybe it’s the Saudis that need regime change?
This is all part of the growing Sunni/Shia conflict. The Saudis are the boss Sunni dog. Iran is the boss Shia dog. Syria is just a proxy conflict. Assad is a member of the minority Alawite Shia sect that rules Syria.