The U.S. State Department has approved the possible sale of a THAAD anti-missile defense system to Saudi Arabia at an estimated cost of $15 billion, the Pentagon said on Friday, citing Iran among regional threats.

The approval opens the way for Saudi Arabia to purchase 44 Terminal High Altitude Area Defense (THAAD) launchers and 360 missiles, as well as fire control stations and radars.

“This sale furthers U.S. national security and foreign policy interests, and supports the long-term security of Saudi Arabia and the Gulf region in the face of Iranian and other regional threats,” the Pentagon’s Defense Security Cooperation agency said in a statement.

Saudi Arabia and the United States are highly critical of what they consider Iran’s aggressive behavior in the Middle East.

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Featured image courtesy of Missile Defense Agency