It also does not have a military and security apparatus able to enforce the will of the government which is hardly of one mind on anything on the country, much less defend the country from outside forces.
In addition to being the leading military force in the Persian Gulf, Iran has 75 million people, giving it a larger population than all other Persian Gulf states combined.
Her part in that movie also caused the Iranian authorities to seize her passport while they investigated her.
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Combine this with a series of regime changes, or simply destabilization on the border of Saudi Arabia, and two things happen.
For most purposes, Bahrain is part of Saudi Arabia.